Friday, January 7, 2011

Movement of Retinosope Reflex


There are two ways to explain how does movement of retinoscope reflex happens. 1) aerial image-blurred image orientation/ position on retinoscopist's retina, 2) Secondary Source-Far point location , MR. Always remember 1) the aerial image will be located either in front of or at  behind examiner's eye, and 2) the Far point, MR will be located either in front of or at  behind patient's eye.


Summary of No. 1


  Summary of No. 2


Please answer the TRUE/FALSE questions below; Each of you (who are currently taking this course) state the reason why does the answer are TRUE or FALSE.

Deadline: 11/01/2011 Tuesday before 8 a.m. 

  1. An eye has ocular refraction of +2.00/-2.00 x 180. Retinoscopy is performed on the eye. Which of the following is TRUE if the retinoscopy is done at 50cm from the patient’s eye?

  1. Against movement is indicated at 180° with working distance lens.
  2. No movement indicated at 90° with working distance lens.
  3. With movement is indicated at 90° without working distance lens.
  4. Against movement is indicated at 180° without working distance lens.
  5. Scissors movement is seen at 180° without working distance lens.

  1. A neutralization point in retinoscopy is achieved

  1. when speed factor is zero.
  2. when speed factor achieved minus sign.
  3. when artificial far point coincide at the patient’s corneal plane.
  4. when not using working distance lens on +2D ametropic eye.
  5. when there is no movement calculated for the reflex.
3.  Given the axial length of an eyeball, k’ 23.22mm. What movement would you observed in retinoscopy using working distance lens +2D at 2/3m?

  1. With movement.
  2. Against movement.  
  3. No movement.
  4. Scissors movement.
  5. Transverse movement.

Happy Weekend. Thank you

52 comments:

  1. salam sir do we need to explain about RET movement?before we answer the true false question....

    ReplyDelete
  2. nuur hani khairuddinJanuary 7, 2011 at 10:14 PM

    salam sir...
    do we need to give reason for each of the choices...
    eg:
    Q1. a)true...explain...
    b)false...explain...
    OR choose only the correct ans.
    eg:
    Q1 only a)true...explain...

    ReplyDelete
  3. @nasrul hadi

    up to all of u..if you think that you might discuss first..just discuss it

    ReplyDelete
  4. @nuur hani khairuddin

    True or False...give reason..

    MCQ..True/ False answer...

    If you are still ambiguous with the direction, please call me for further explaination

    ReplyDelete
  5. 2.

    A.True -nuralization point,K=-W.speed factor will be infinity or zero.

    B.False-minus sign indicates againts movement so that neutralization is not yet achieved!

    C.False-the artificial far point is in sight-hole plane.

    D.False-using working distance lens,myope will not accommodate.(its not neutralization point)

    E.True-Neutralization point,prctitioner sees the pupil filled with light but cannot detect a movement.

    ReplyDelete
  6. 1.

    A.False-power at 180 is +2D.it should be with movement.

    B.True-power at 90 is plano.

    C.True-the power at 90 is +2D

    D.False-the power at 180 is +4D.so that with movement

    E.False-scissors movement cant be seen at 180 as well as at 90.

    3.

    A.False-ocular refraction of the eye is myopic.so it should be against movement.

    B.True-(explaination no1)

    C.False-there is ocular refraction is myopic

    D.False-theres no movement other than 180 and 90 meridian

    E.False-no tranverse movement observed.

    ReplyDelete
  7. 2.
    A-False: bcoz speed factor cannnot be equal to zero as working distance (WD)is taken into account in the fomula W/(W+K)

    B-False: bcoz minus sign indicates that there's still movement - against movement

    C-False: artificial far point should coincide at the sight hole of retinoscope when the neutralization point is reached

    D-False: WD has been fixed either at 50 cm (+2D) or at 2/3 cm (+1.5D)

    E-True

    ReplyDelete
  8. @fazril

    is it true that infinity is equal to zero?
    zero has value. infinity=math error

    ReplyDelete
  9. @Nur Rabiha
    dont know actually..hehe
    i just assume because vergence at infinity is equal to zero...am i right?

    ReplyDelete
  10. now i get to know that some o my answers are wrong..adoi...
    i will post another answer..

    ReplyDelete
  11. salam for all of you.
    1.
    a:false,if it against movement the ocular ref should be -2.00/-2.00

    B:true,it is A neutralization point.

    C:true because we remove the working distance lens.

    D:false No 1

    E:false.


    2

    A:true because cannot detect a movement.

    B:false still there is against movement.

    C:false,when artificial far point coincide at the patient’s retena not the cornea

    D:false we will see W/w=k wit movement.

    E:true k=w infinite

    3
    from what i know
    that if the axial length changed 1 mm will occurs 3D diffrent and the normal eye 22.22 mm
    in this case the patient myopic
    because the F in front of the retna

    A:fales, the patient myopic

    B: true

    C:true because when we increase
    working distance from .50 mm to .66 mm this will occurs against movement and the patient myopic ordy.
    d:fales
    :E fales

    correct me if i am wrong
    good luck for all of you(:0)

    ReplyDelete
  12. SALAM..tumpang lalu..

    hint:

    *for question 1, please ceraikan dan buat dlm btk cross dahulu..sebelum jawab soklan..

    TQ..

    ReplyDelete
  13. Awatif Akmal ArshadJanuary 11, 2011 at 12:22 AM

    Salam..

    1. A)FALSE- because at 180 it should be with movement because power at 180 is +2D

    B)TRUE- because at 90, the power is plano.

    C)FALSE- it should be against,because induced to became power of -2D without working distance

    D)FALSE- because it should no movement detected because it induced to produce plano at 180.

    E)FALSE- because it should no movement detected because it induced to produce plano at 180.and scissors movement is only seen on other degree but not at 90 or 180.

    ReplyDelete
  14. Nasrul Hadi Mohd SanadiJanuary 11, 2011 at 12:45 AM

    2 A.False when K approaches -W,the speed factor in increase until its infinite..infinite not same with zero..neutralisation cannot occur at zero..
    B.False because when speed factor is minus,myopic occur not neutralisation.
    C.False bcos neutralisation occur when artificial far point coincide at sight hole plane.
    D.False bcos without WD lens,it will induce more hyprope so it will move with movement,slow and dull..
    E.True ..bright colour can be seen on patients retina.




    its myopic since its axial length is bigger than 22.22mm.but the curvature power is about 57..so we know its hyperope bcos its under 60 ..can u see that it give +2D = 2/3m..normally we use +2D for 50 cm and +1.5D for 2/3m..now we have +0.5 excess for distance 2/3m..+0.5 excess will induce the myopic power from -3 to -3.5..so conclusion is its myopic..this from what i understand..



    3 A.False because its type of ametropia is myopic so its against movement.
    B.True since its myopic
    C.False ..its not neutral.its myopic
    D.False there is no movement except 180 and 90 meridian..
    E.false no transverse can be seen..

    ReplyDelete
  15. try you best even though u haven't finished the lecture yet.

    lepas kelas nanti kamu akan mudah faham n igt.

    ReplyDelete
  16. Q1:

    A-True
    B-False: with movement should be seen at 90 degree
    C-True
    D-False: it should be no movement at 180 degree
    E-False: scissors movement should be seen at 90 or 180 degree not at one line only

    ReplyDelete
  17. Question 1:
    A)False: it should be with movement because power at 180 is +2.00 with working distance lens.
    B)True:because it become plano at 90 with working distance lens.
    C) False:it should be against movement because power at 90 is -2.00 without working distance lens.
    D)False:it should be no movement because power at 180 is plano without working distance lens.
    E)False:no scissors movement because power at 180 is plano without working distance lens.

    Question 2:
    A)True:because when speed factor is zero,there should be no movement.
    B)False:because minus sign indicate against movement,but for neutralization point,it should be no movement.
    C)False:artificial far point should coincide at the sight-hole of retinoscope for neutralization point.
    D)False:because without using working distance lens,the eyes will accommodate and produce power.
    E)True:because no movement indicate the neutralization point.

    Question 3:
    A)False:because the eye is myopic,and for myopic eyes,the movement should be against.
    B)True:because against movement indicates the myopic eyes.
    C)False:because it should have against movement for myopic eyes.
    D)False:it should be against,not scissors movement.
    E)False:it should be against movement.

    ReplyDelete
  18. SYAZWAN HAFIZ MOHDJanuary 11, 2011 at 1:19 AM

    QUESTION 1

    A) false-since it has a power of +2.00D at 180,the movement is with movement.

    B) true-since it is plano at 90,there is no movement is detected.

    C) false-since there is no working distance lens is placed in front of patient's eye,the power at 90 is -2.00D.So there should be against movement.

    D) false-since there is no working distance lens,there is no power at 180.So,there is no movement detected.

    E) false-scissors movement is only detected in astigmatism and at axis other than 90 & 180


    QUESTION 2

    A) false because to achieve the neutralization,K=-W. So,when substitute into the equation, speed factor= W/W+K we will get infinity,not zero.

    B) false because when the neutralization is achieved,there should be no movement.

    C) false because neutralization will occur when the far point is crossed in side hole of the retinoscope.

    D) false because without working distance lens, it will induce more hyperope. So it will move with movement,slow n dull.

    E) true because there is no movement when neutralization is achieved.


    QUESTION 3

    A) false because there is a myopic eye.

    B) true because it is a myopic eye n have the ocular refraction of negative power.

    C) false because there is a power on the eye.

    D) false because that movement only for astigmatism.

    E) false because that movement only for astigmatism.

    ReplyDelete
  19. Awatif Akmal ArshadJanuary 11, 2011 at 1:21 AM

    no 2)

    A)FALSE- because zero is still have movement.no movement should be infinite

    B)FALSE- because minus sign is against movement

    C)FALSE-because the far point of eye should correlates with the location of peephole of retinoscope.

    D)FALSE- because it will be against movement

    E)TRUE- because no movement of reflex

    ReplyDelete
  20. Question 1:
    A)False: it should be with movement because power at 180 is +2.00 with working distance lens.
    B)True:because it become plano at 90 with working distance lens.
    C) False:it should be against movement because power at 90 is -2.00 without working distance lens.
    D)False:it should be no movement because power at 180 is plano without working distance lens.
    E)False:no scissors movement because power at 180 is plano without working distance lens.

    Question 2:
    A)True:because when speed factor is zero,there should be no movement.
    B)False:because minus sign indicate against movement,but for neutralization point,it should be no movement.
    C)False:artificial far point should coincide at the sight-hole of retinoscope for neutralization point.
    D)False:because without using working distance lens,the eyes will accommodate and produce power.
    E)True:because no movement indicate the neutralization point.

    Question 3:
    A)False:because the eye is myopic,and for myopic eyes,the movement should be against.
    B)True:because against movement indicates the myopic eyes.
    C)False:because it should have against movement for myopic eyes.
    D)False:it should be against,not scissors movement.
    E)False:it should be against movement.

    ReplyDelete
  21. Nur Farrahin Bt Mohd Nor KamalJanuary 11, 2011 at 1:32 AM

    QUESTION 1

    A-false : with working distance lens,there is power at 180 in the system that is +2.00,so it should be with movement.
    B-true : with working distance lens,there is no power at 90 in the system that is plano,so there should be no movement detected.
    C-false: without working distance lens,there is power at 90 in the system that is -2.00,so it should be against movement
    D-false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected.
    E- false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected. Furthermore scissors movement is for astigmatism.

    QUESTION 2

    A- true: no movement detected cause the speed is zero,neutralization achieved. B- false: minus sign indicate against movement,so no neutralization occur.
    C- false : the artificial far point should coincide at the retinoscope’s sight hole to achieve neutralization.
    D-false: because without working distance lens,the eye will accommodate and produce some movement either against or with movement.
    E-true : no movement means neutralization achieved

    QUESTION 3

    The axial length 23.22 is longer than actual axial length that is 22.22,thus the eyeball is longer which indicate myopic eye and the type of movement produce by myopic eye is against movement.

    A- false: because it should be against movement
    B-true: myopic eye have against movement
    C-false: because it should be against movement,usually no movement detected occur in emmetropic eye
    D-false: because it should be against movement
    E-false: because it should be against movement

    ReplyDelete
  22. Norain Binti RazaliJanuary 11, 2011 at 1:32 AM

    questio 1:
    A.False-with the working distance lens, the power should be +2.00D at 180.it should be with movement.

    B.True; with the working distance lens, the power at 90 is plano. Hence, there should be no movement detected.

    C.False; without the working distance lens, the power at 90 is -2D. So, the against movement should be detected.

    D.False; without the working distance lens, the power at 180 is plano, So, there is no movement that should be detected.

    E.False; without the working distance lens, the power at 180 is plano (no movement), while the power at 90 is -2D (against movement) . Hence, scissors movement can’t be seen because it should include powers at both meridian, producing 2 different movement.

    Question 2:
    A: True; when speed is zero, there will no movement detected.

    B:False; when there is minus sign(minus power),there should be against movement detected.

    C:False; artificial far point should coincide at sight-hole of the retinoscope, not at the cornea.

    D:False; without using any working distance lens, the eye is not in the unaccommodate condition, producing either positive power (with movement) or negative power (against power).

    E:True; no movement meaning that the neutralization has been achieved.

    Question 3:
    The normal k’ for the reduced eye should be 22.22mm. when k’ is 23.22mm (longer eyeball), it indicated the myopic eye. Myopic eye will produce the against movement.
    While the working lens +1.5D for 2/3m distance.

    A.False; Myopic eye will produce the against movement.

    B.True; since the eye is the myopic condition.

    C.False; since it is myopic eye(against movement),there still have a reflex in the movement of retinoscope.

    D.False; against movement.

    E.False; no transverse movement..

    ReplyDelete
  23. Question 1:
    A. False: With movement is indicated at 180° with working distance lens, +2.00
    B. True: Because plano is at 90°, so no power and no movement can be seen
    C. False: Against movement can be seen at 90° with working distance lens,-2.00
    D. False: No movement can be seen at 180° without working distance because there is no power(plano)
    E. False: There is no power at 180° (plano) without working distance lens and scissor movement can only be seen in astigmatic eye

    Question 2:
    A.True:As speed is zero,thus no movement is indicated
    B.False:Minus sign indicates against movement still can be seen
    C.False: The artificial far point should coincide at the sight hole of retinoscope not the corneal instead of corneal plane
    D.False:Without using working distance lens,thus the eye will accommodate and produce power in the eye which not will meet neutralization point
    E.True:because the light fall direct on the retina and produce no movement reflex

    Question 3:
    A.False:the axial length is longer than the normal axial length(22.22mm),thus image falls in front of the retina shows against movement
    B.True:Second focal point coindice in front of retina showing against movement
    C.False:There is against movement seen in the myopic eye
    D.False:No scissor movement as this is a myopic eye which either meridian is plano
    E.False:No transverse movement indicated here.

    ReplyDelete
  24. Nur Farrahin Bt Mohd Nor KamalJanuary 11, 2011 at 1:38 AM

    QUESTION 1

    A-false : with working distance lens,there is power at 180 in the system that is +2.00,so it should be with movement.
    B-true : with working distance lens,there is no power at 90 in the system that is plano,so there should be no movement detected.
    C-false: without working distance lens,there is power at 90 in the system that is -2.00,so it should be against movement
    D-false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected.
    E- false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected. Furthermore scissors movement is for astigmatism.

    QUESTION 2

    A- true: no movement detected cause the speed is zero,neutralization achieved. B- false: minus sign indicate against movement,so no neutralization occur.
    C- false : the artificial far point should coincide at the retinoscope’s sight hole to achieve neutralization.
    D-false: because without working distance lens,the eye will accommodate and produce some movement either against or with movement.
    E-true : no movement means neutralization achieved

    QUESTION 3

    The axial length 23.22 is longer than actual axial length that is 22.22,thus the eyeball is longer which indicate myopic eye and the type of movement produce by myopic eye is against movement.

    A- false: because it should be against movement
    B-true: myopic eye have against movement
    C-false: because it should be against movement,usually no movement detected occur in emmetropic eye
    D-false: because it should be against movement
    E-false: because it should be against movement

    ReplyDelete
  25. @azuwanmusa

    For this topic, I've already delivered the lecture

    ReplyDelete
  26. Nur Farrahin Bt Mohd Nor KamalJanuary 11, 2011 at 1:44 AM

    QUESTION 1

    A-false : with working distance lens,there is power at 180 in the system that is +2.00,so it should be with movement.
    B-true : with working distance lens,there is no power at 90 in the system that is plano,so there should be no movement detected.
    C-false: without working distance lens,there is power at 90 in the system that is -2.00,so it should be against movement
    D-false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected.
    E- false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected. Furthermore scissors movement is for astigmatism.

    QUESTION 2

    A- true: no movement detected cause the speed is zero,neutralization achieved B- false: minus sign indicate against movement,so no neutralization occur
    C- false : the artificial far point should coincide at the retinoscope’s sight hole to achieve neutralization.
    D-false: because without working distance lens,the eye will accommodate and produce some movement either against or with movement.
    E-true : no movement means neutralization achieved.

    QUESTION 3

    The axial length 23.22 is longer than actual axial length that is 22.22,thus the eyeball is longer which indicate myopic eye and the type of movement produce by myopic eye is against movement.

    A- false: because it should be against movement
    B-true: myopic eye have against movement
    C-false: because it should be against movement,usually no movement detected occur in emmetropic eye
    D-false: because it should be against movement
    E-false: because it should be against movement

    ReplyDelete
  27. Awatif Akmal ArshadJanuary 11, 2011 at 1:50 AM

    Q3

    A)FALSE- because it should be against movement,because from calculation from Fe=K'-K (i dont know im right or not)we get power is negative
    (-1.44D ) and the length of eye is longer than actual which is 22.22 thus having myopic eye..

    B)TRUE- because it is myopic eye having against movement

    C)FALSE- because it is myopic eye,should have against movement

    D)FALSE- because it is myopic eye,should have against movement

    E)FALSE-because it is myopic eye,should have against movement

    ReplyDelete
  28. Nasrul Hadi Mohd SanadiJanuary 11, 2011 at 1:51 AM

    Question 1

    A.False since its power at 180 is +2D(with movement)
    B.True bcos its plano at 90
    C.False is must be against movement bcos its power is -2D at 90 without working distance lens..
    D.False bcos it must be no movement because power at 180 is plano without working distance lens...
    E.False .. no scissors movement can be seen since there is plano at 180 when no WD so no astigmastism
    ...

    ReplyDelete
  29. Q1:

    A-True: bcoz the eye has been neutralised by WDL. by using retinoscope, -2.00 will be seen through the eye at 180 degree.
    -ve power o the eye indicates against movement

    B-False: with movement should be seen at 90 degree.

    C-True: WDL will induce more power to eye when using through retinoscope. so the power become +4.00. with movemnt will be observed.

    D-False: no movement should be observed at 180 degree bcoz neutralisation pt has been achieved.

    E-False:scissors movemnt should be seen at 90 and 180 not only at single line.

    ReplyDelete
  30. salam..

    for question no 1:

    A- true because the eye has been neutralised by the working distance lens, so against movement can be detected since it is hyperope.
    B-false because it supposed with movement since the hyperope has been induced.
    C-true because it is with movement and can be considered as over with movement since without working distance lens(from the formula), it will induce hyperope.
    D-false because from the formula it should be no movement.
    E-false because the scissors movement can be seen at 90.

    question 2:

    A-true because speed factor=0 indicates no movement=achieve neutralization point.
    B-false because it is indicate that there is still movement which is against movement since minus sign.
    C-false because neutralization point achieved when artificial far point coincide at sight hole.
    D-true because from the formula power of the eye=power of ret-working distance,we will get 0 or plano which means neutralization point.
    E-true because no movement of reflex=neutralization point.

    question 3:

    A-false because the axial length is more than normal(22.22mmm)which has indicate it is myopic.
    B-true because same reason with A and there is still minus power after refraction which means it is myopic.
    C-false because it is myopic not emmetropic.
    D-false because scissors movement is reflex for astigmatism.
    E-false because no transverse movement indicated here.

    ReplyDelete
  31. Q2:

    A-True: when speed factor is equal to zero, then it means no movement

    B-False: if speed factor has minus sign, it indicates that the presence of against movement

    C-False: artificial far point should coincide at the sight hole of retinoscope if neutralization pt has been achieved

    D-True: by using formula, power of the eye = power of the ret - WDL. zero power or plano is achieved. here is no movemnt observed which shows that neutralization pt is achieved

    E-True: no movemnt achieved when neutralization pt achieved

    ReplyDelete
  32. sory..for question no 1:
    B-false because it has been neutralised so suppose with movement should be indicated at 90.

    ReplyDelete
  33. Q3: the person has axial myope bcoz the axial length is longer. Against movemnt is observed. Since it is myope, only against movment should be seen.

    A-False

    B-True: bcoz there is still minus power after refraction bcoz the exmainer deos not use WDL:+1.50 D. this WDL is not enough to neutralise the refractive error of the pt's eye.

    C-False

    D-False

    E-False

    ReplyDelete
  34. nuur hani khairuddinJanuary 11, 2011 at 2:22 AM

    Q1

    a) true- the eye is hyperope.

    b) false-because the movement should be at 90.

    c) true-because it will produce hyperope.

    d) false-it should be no movement.

    e) false

    Q2

    a)true-when K=-W, the speed of reflex increases until infinite, thus neutralization point is achieved.

    b)false-it will produce against movement/myope.

    c)false-neutralization point achieved when light coming from the patient retina focused on the sight hole.

    d) true- because F= Fsp -W

    e)true- this show that the light has illuminate the patient retina and the far point is at infinity.

    Q3

    a) false- because it is for hyperope...

    b) true- because when axial length, k'> 22.22mm, it shows axial myope

    c) false-because the k'=22.22mm

    d) false

    e) false

    ReplyDelete
  35. Q1.
    A. false - power at 90 degree is (plano) as the WDL=+2.00d..n 180 degree bcomes +2.00d. it indicates the with movement.

    B. true - bcoz..power at 180 degree is +2.00d , WDL neutralizes the vergence of working distance..so no reflex is movement is observe at 90 degree

    C. False - false, bcoz power at 90 degree is -2.00d , so it indicates against movement..both power n vergences are cancelled each another...

    D. False - power at 90 degree is -2d...no movement at 180 degree.

    E. False -scissor movement only exists in oblique astig


    Q2

    A.false because to achieve the neutralization,K=-W. So,when substitute into the equation, speed factor= W/W+K we will get infinity,not zero.so there should be no movement.
    B.false bcoz when mention about minus sign it refers to against movement
    c.false becoz the neutralisation achieved when the far point is coincide at sight hole plane
    D.false becoz the working dist lens always fix with 2D or vergence of 2/3 m.
    E.true because the movement is undetected when neutrality is achieved.


    Q3

    A.false.bcoz it is true when we consider k'only...but when it take account of wd lens and vergence..so it have induced the hyperope to myope.
    B.true.because +0.5 excess from the cancellation between vergence and power will induce the myopic power from -3 to -3.5d(from the K) ..so conclusion is its myopic.
    C.false.because there should be against movement
    D & E...they are not form in axis of 180 n 90 degree...so there is no transverse n scissor movement detected.

    please correct me if im wrong.. too confius right now with the others answers...

    ReplyDelete
  36. nurjannah ngatimanJanuary 11, 2011 at 3:19 AM

    bismillahirrahmanirrahim...

    1.
    A.-FALSE-there is power of +2D,
    B.-TRUE-it is plano, that have no power, no movement
    C.-TRUE-the lens is removed, so, at 90o there is power of -2D, so, hyperope, with movement
    D.-FALSE-the lens is removed, so, at 180° there is plano, that have no power, it should be no movement
    E.–FALSE-as reason D. scissors movement have movement those are not “neutral”, “with” or “against”

    2.
    A.–TRUE-if PLUS sign indicates WITH movement and MINUS sign indicates AGAINST movement, speed factor is zero indicates NO movement that is reach neutralization point.
    B.–FALSE-minus sign of the speed factor indicates AGAINST movement, not NO movement. So, neutralization point is not achieve.
    C.–FALSE-the correct sentence is actually ‘when artificial far point coincide at the EXAMINER’s corneal plane’
    D.–FALSE-The eye is having myopic eye. So, against movement is detected. It is not reach neutralization point.
    E.–TRUE-neutralization point is reach when there is no movement

    3.
    working distance lens, WDL= 1/wd
    WDL= 1/2/3
    = +1.5D,
    -this calculation mean that, WDL that should be used by the examiner to put in front of patient’s eye is +1.5 D, but the question used +2D. So, the power is higher +0.5D than it should be. When it is so, the retinal image formed at patient’s eye is in front of the retina.The eye is having myope. As examiner shines the light on patient’s eye in the vertical position and moves the light, the image reflex appeared to opposite the direction. It is called AGAINST movement. So, to correct this by using minus lens.
    A.-FALSE-the eye is having myopic eye. So, AGAINST movement is observed, not WITH movement.
    B.–TRUE- the retinal image formed at patient’s eye is in front of the retina.The eye is having myope. So, it is having AGAINST movement.
    C.-FALSE-the eye is having myopic eye. So, AGAINST movement is observed not NO movement.
    D.-FALSE-the eye is having myopic eye. So, AGAINST movement is observed, not SCISSORS movement.
    E.-FALSE-the eye is having myopic eye. So, not TRANSVERSE movement is observed.

    ReplyDelete
  37. Muhammad Jazli Che Mohd AriffJanuary 11, 2011 at 3:41 AM

    QUESTION 1

    A)FALSE-at 180,the power is +2.00D....so,with movement

    B)TRUE-at plano (90),no movement

    C)FALSE-without working distance lens...at 90,power is -2.00D....so,against movement..

    D)FALSE-without working distance lense...at 180,no power(plano)...so,no movement

    E)FALSE-scissors movement can only be founded in astigmatism...at axis other than 90& 180

    QUESTION 2

    A)FALSE-neutralization is achieved when K=-W...substitute into equation,speed factor=W/W+K...we will get infinity...not zero,ok..

    B)FALSE-minus sign..against mvmnt..it should be no movement when the neutralization is achieved..

    C)FALSE-artificial far point should be cross in the sight-hole plane..

    D)FALSE-by using working distance lenses the neutralization might occur..

    E)TRUE- when the neutralization is achieved...no movement...

    QUESTION 3

    A)false-it's myopic...against mvmnt..

    B)true-it's myopic..ocular refraction...-ve power...

    C)false-should be against movmnt

    D)false-should be against movement...that movemnt only for astigmatism

    E)false- should be against..that movemnt only for astigmatism movement

    ReplyDelete
  38. SUYIDATINA BT SULAIMANJanuary 11, 2011 at 4:59 AM

    Assalamualaikum...

    QUESTION 1

    a)FALSE.. bcoz at 180 degree, the power is +2D thus with mvment
    b)TRUE...bcoz at 90 degree,the power is plano.Working distance lens cancelled power that existed with the working distances
    c)FALSE...bcoz without working distance lens, the power is -2D in 90 degree
    d)FALSE...without w.d.lens, power in 180 degree (+2D) become plano bcoz it is cancelled with -2D from the w.distances
    e)FALSE...bcoz scissor is neither with nor without movement.In this case, there is with movement when power is +2D at 180 degree

    ** i'm quite confusing with the
    +2 and -2 value..please correct me if i'm wrong..

    QUESTION 2

    a)TRUE...if speed factor =-ve, against movement. if speed factor =+ve, with movement..therefore, if speed factor =0, neutrality is achieved
    b)FALSE..minus sign of speed factor indicates against movement in myopic eye
    c)FALSE...neutrality achieved when far point of the patient's eye coincide with the cornea of the examiner's eye
    d)FALSE..with no working distance lens in place b4 the patient's eye, the reflected rays of light will be converged in myope
    e)TRUE..patient's pupil is filled with light, no motion is observed when neutrality is achieved

    QUESTION 3

    -standard reduced eyes axial length = +22.22mm
    -in this case, +23.22mm, extra +1mm
    -1mm change in axial length of eye corresponds to +2.7D or +3D of refractive power-patient's having axial myopic
    -working distance 2/3m = +1.5D but used working distance lens is +2D thus extra +0.5D
    -eyes will have +3.5D power..
    -therefore,eye is myopic, thus against movement

    a)FALSE..eye is myopic, thus against movement
    b)TRUE..eye is myopic, thus against movement
    c)FALSE..have movement
    d)FALSE..scissor is neither against nor with movement..but in this case, it's against movement
    e)FALSE..never heard about transverse movement.is it exist??

    ReplyDelete
  39. Question 1:
    A. false - after adding and cancel each other with WDL=+2.00D n vergence=+2.00D,power at 90 degree is (plano)n 180 degree becomes +2.00D.indicates the with movement.

    B. true - WdL neutralized with vergence of working distance makes the 90 degree become plano= no movement occur

    C. False - false, bcoz power at 90 degree is -2.00D , so it indicates against movement..both power n vergences are cancelled each another...

    D. False -without WDL,no movement occur at 180 degree(plano)

    E. False -scissor movement only exists in oblique astig thus,no scissors movement occur because power at 180 is plano without working distance lens.



    Question 2:

    A.false because to achieve the neutralization,K=-W. So,when substitute into the equation, speed factor= W/W+K we will get infinity,not zero.there should be no movement.

    B.false coz minus sign is refers to against movement

    c.false coz the neutralization achieved when the far point is coincide at sight hole plane

    D.false-without using working distance lens,the eyes will accommodate and produce power.

    E.true because no movement occur when neutrality is achieved.


    Question 3:

    A.false-when it take account of WDL and vergence..so it have induced the hyperope to myope. so,it should be against movement..

    B.true- coz it is myopic,cancellation between vergence and power produced excess +0.5D makes myopic become greater from -3 to -3.5D(from the differences of K) ..

    C.false.because there should be against movement

    D & E-both false...they are not form in axis of 180 n 90 degree...so there is neither transverse nor scissor movement.

    *SIR...pleaaaaazes correct me if i'm wrong...

    ReplyDelete
  40. Siti Hawa Saadah HamdanJanuary 11, 2011 at 5:02 AM

    bismillahirrahmanirrahim..
    assalamualaikum...correct me if I'm wrong..

    Question no. 1
    A:FALSE,power at 180 degree is +2D,therefore it is with movement
    B:TRUE, plano at 90 degree which means that there is no movement at 90 degree.
    C:FALSE,without working distance lense, the power at 90 degree should be -2D. Thus, it indicate as against movement.
    D:FALSE,the power at 180 degree without working distance lense should be plano. Thus, it indicate as no movement.
    E:FALSE,scissors movement is only for astigmatism patient. Both meridian should include power. Without working distance lense, power at 180 degree is -2D while it is plano at 90 degree. Therefore, scissors movement cannot be observed.

    Question no. 2
    A:TRUE,according to speed factor formula:W/(W+K),when speed factor is zero,then, there is no working distance,thus, shows no movement.
    B:FALSE,minus sign shows against movement,that is myope.so,no neutralization point is achieved.
    C:FALSE,to achieved neutralization point, the artificial far point should be coincide at examiner’s corneal plane.
    D:FALSE,because +2D indicate myopia. So, there will be against movement and can’t achieve neutral point.
    E:TRUE,no movement is detected at neutralization point.

    Question no. 3
    The normal axial length is k’=22.22mm for working distance lens +1.5D at 2/3m. Therefore, when the axial length is more than the normal which is k’=23.22mm, the working distance lens of +2D is not enough to neutralize the refraction. Thus, the patient is indicated as myopia.
    A:FALSE,this movement is for hyperope patient.
    B:TRUE,this movement is for myope patient.
    C:FALSE,this movement is for emmetropia patient.
    D:FALSE,this movement for astigmatism patient.
    E:FALSE,no tranverse movement.

    ReplyDelete
  41. Nur Farrahin Bt Mohd Nor KamalJanuary 11, 2011 at 6:55 AM

    QUESTION 1

    A-false : with working distance lens,there is power at 180 in the system that is +2.00,so it should be with movement.
    B-true : with working distance lens,there is no power at 90 in the system that is plano,so there should be no movement detected.
    C-false: without working distance lens,there is power at 90 in the system that is -2.00,so it should be against movement
    D-false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected.
    E- false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected. Furthermore scissors movement is for astigmatism.

    QUESTION 2

    A- true: no movement detected cause the speed is zero,neutralization achieved B- false: minus sign indicate against movement,so no neutralization occur
    C- false : the artificial far point should coincide at the retinoscope’s sight hole to achieve neutralization.
    D-false: because without working distance lens,the eye will accommodate and produce some movement either against or with movement.
    E-true : no movement means neutralization achieved.

    QUESTION 3

    The axial length 23.22 is longer than actual axial length that is 22.22,thus the eyeball is longer which indicate myopic eye and the type of movement produce by myopic eye is against movement.

    A- false: because it should be
    against movement
    B-true: myopic eye have against movement
    C-false: because it should be against movement,usually no movement detected occur in emmetropic eye
    D-false: because it should be against movement
    E-false: because it should be against movement

    ReplyDelete
  42. muhammad hazwan razakJanuary 11, 2011 at 7:38 AM

    slm all,
    please correct me if im wrong

    Q1

    A)FALSE = THE ANSWER SHOULD BE WITH MOVEMENT

    B)TRUE = AT 90 DEGREE THE POWER IS PLANO

    C)FALSE= AT 90 DEGREE THE POWER IS PLANO

    D)FALSE = NO POWER(WITHOUT WORKING DISTANCE)=NO MOVEMENT

    E)FALSE= NO POWER(WITHOUT WORKING DISTANCE)=NO MOVEMENT

    Q2

    A)FALSE= THE ANSWER SHOULD BE INFINITY WHEN WE APPLY (K=-W) IN EQUATION W/W+K=SPEED FACTOR

    B)FALSE = MINUS SIGN RESULT IN AGAINST MOVEMENT

    C)FALSE = NEUTRALIZATION ACHIEVE WHEN FAR POINT COINCIDE AT SIGHT POLE

    D)FALSE

    E)TRUE = NEUTRALIZE ACHEIVE=NO MOVEMENT

    Q3)
    IN THIS CASE IS MYOPIC BECAUSE STANDAR REDUCE EYE AXIAL LENGTH =+23.22mm (NORMAL + 22.22mm)

    A)FALSE = WITH MOVEMENT FOR HYPEROPE

    B)TRUE = MYOPIC PATIENT WILL RESULT IN AGAINTS MOVEMENT FOR THE MOVEMENT OBSERVE IN RET

    C)FALSE = THIS IS FOR NORMAL EYE

    D)FALSE = IT ONLY FOR ASTIGMATISM PATIENT

    E)FALSE = DON'T KNOW, SORRY SIR.

    ReplyDelete
  43. sir,such these questions will come up in exam?

    ReplyDelete
  44. muhammad fahmi ananJanuary 11, 2011 at 7:51 AM

    question 1

    A. false : because at 180 it is +2D then it should be with movement.
    B. true : because at 90 it is plano then supposed to beno movement,no power
    C : false : because without WD it is -2D, should be against movement
    D : false : because it should be no movement
    E : false because it should be no movement. movement only can be detected if the degrees lies on besides angles of 90 and 180.

    question 2

    A : false : because we get power is infinity
    B : false : minus sign refers to against movement
    C : false : neutralisation occured if the far point is coincide at sight hole plane
    D : false : because working distance lens always fix with 2D
    E : true : the movement is undetected

    question 3

    A :false : it is myope then should be against movement
    B : true : because it is myopic
    C : false because there should be against movement
    D : false : not form in axis of 90 and 180
    E : false : same explanation as D

    ReplyDelete
  45. MOHD SYUKRI AMINUDDINJanuary 11, 2011 at 8:17 AM

    Question 1
    A.FALSE  since the power at 180 degree is +2.00D, with working distance lens, it should be with movement.
    B.TRUE  since the power at 90 degree is plano, with working distance lens, definitely no movement.
    C.FALSE  since the power at 90 degree is -2.00D, without working distance lens, it should be aganist movement.
    D.FALSE  since the power at 90 degree is -2.00D, the power at 180 degree is plano. without working distance lens, it should be no movement.
    E.FALSE  scissors movement is only detected in astigmatism and at axis other than 90 and 180

    Question 2
    A) FALSE  because to achieve the neutralization,K=-W. So,when substitute into the equation, speed factor= W/W+K we will get infinity.

    B) FALSE  when the neutralization is achieved,there should be no movement.

    C) FALSE  artificial far point should coincide at the sight-hole of retinoscope for neutralization point.

    D) FALSE without using working distance lens,the eyes will accommodate and produce power.


    E) TRUE  there is no movement when neutralization is achieved.

    Question 3
    A)FALSE it's myopic, should be against movement

    B)TRUE it's myopic, should be against movement

    C)FALSE should be against movement

    D)FALSE should be against movement

    E)FALSE  should be against movement

    ReplyDelete
  46. Nur Farrahin Bt Mohd Nor kamalJanuary 11, 2011 at 8:38 AM

    salam sir,
    i've post the commment like 5 times already since yesterday,
    why it didn't come out here..

    ReplyDelete
  47. QUESTION 1

    A-false : with working distance lens,there is power at 180 in the system that is +2.00,so it should be with movement.
    B-true : with working distance lens,there is no power at 90 in the system that is plano,so there should be no movement detected.
    C-false: without working distance lens,there is power at 90 in the system that is -2.00,so it should be against movement
    D-false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected.
    E- false : without working distance lens,there is no power at 180 in the system that is plano,so there should be no movement detected. Furthermore scissors movement is for astigmatism.

    QUESTION 2

    A- true: no movement detected cause the speed is zero,neutralization achieved
    B- false: minus sign indicate against movement,so no neutralization occur
    C- false : the artificial far point should coincide at the retinoscope’s sight hole to achieve neutralization.
    D-false: because without working distance lens,the eye will accommodate and produce some movement either against or with movement.
    E-true : no movement means neutralization achieved.

    QUESTION 3

    The axial length 23.22 is longer than actual axial length that is 22.22,thus the eyeball is longer which indicate myopic eye and the type of movement produce by myopic eye is against movement.

    A- false: because it should be against movement
    B-true: myopic eye have against movement
    C-false: because it should be against movement,usually no movement detected occur in emmetropic eye
    D-false: because it should be against movement
    E-false: because it should be against movement

    ReplyDelete
  48. Assalamualaikum..

    Q1
    A – false – with movement
    B – true – at 90 degree, power is 0 (plano), so no movement
    C – false – against movement
    D – false – no movement
    E – false – no movement

    Q2
    A – false – neutralization cant occur at zero
    B – false – minus sign movement indicate against movement
    C – false – far point should coincide at sight hole plane
    D – false – eye will accmodate and produce power
    E – true – no movement observed because achieve neutralization point

    Q3
    A – false – this movement is for hyperopic eye
    B – true – this movement is observed for myopic eye
    C – false – no movement indicate it is emmetrope
    D – false – this movement indicate astigmatism
    E – false – should be against movement

    Alah a'lam

    ReplyDelete
  49. correction..

    ALLAH a'lam

    ReplyDelete
  50. NUR FARRAHIN BT MOHD NOR KAMALJanuary 11, 2011 at 9:43 AM

    QUESTION 1

    A-FALSE: WITH WORKING DISTANCE LENS,THERE IS POWER AT 180 IN THE SYSTEM THAT IS +2.OO,SO IT SHOULD BE WITH MOVEMENT
    B- TRUE: WITH WORKING DISTANCE LENS,THERE IS NO POWER AT 90 IN THE SYSTEM THAT IS PLANO,SO THERE SHOULD BE NO MOVEMENT DETECTED.
    C- FALSE:WITHOUT WORKING DISTANCE LENS,THERE IS POWER AT 90 IN THE SYSTEM THAT IS -2.00,SO IT SHOULD BE AGAINST MOVEMENT.
    D-FALSE:WITHOUT WORKING DISTANCE LENS,THERE IS NO POWER AT 180 IN THE SYSTEM THAT IS PLANO,SO THERE SHOULD BE NO MOVEMENT DETECTED.
    E-FALSE:WITHOUT WORKING DISTANCE LENS,THERE IS NO POWER AT 180 IN THE SYSTEM THAT IS PLANO,SO THERE SHOULD BE NO MOVEMENT DETECTED.FURTHERMORE SCISSORS MOVEMENT IS FOR ASTIGMATISM.

    QUESTION 2

    A- TRUE : NO MOVEMENT DETECTED CAUSE THE SPEED IS ZERO,NEUTRALIZATION ACHIEVED.
    B-FALSE: MINUS SIGN INDICATE AGAINST MOVEMENT,SO NO NEUTRALIZATION OCCUR.
    C-FALSE:THE ARTIFICIAL POINT SHOULD COINCIDE AT THE RETINOSCOPE'S SIGHT HOLE TO ACHIEVE NEUTRALIZATION.
    D-FALSE : BECAUSE WITHOUT WORKING DISTANCE LENS,THE EYE WILL ACCOMODATE EITHER AGAINST OR WITH MOVEMENT.
    E-TRUE : NO MOVEMENT MEANS NEUTRALIZATION ACHIEVED

    ReplyDelete
  51. NUR FARRAHIN BT MOHD NOR KAMALJanuary 11, 2011 at 9:47 AM

    QUESTION 3

    The axial length 23.22mm is longer than actual axial length that is 22.22MM,thus the eyeball is longer which indicate myopic eye and the type of movement produce by myopic eye is against movement.

    A-FALSE : BECAUSE IT SHOULD BE AGINST MOVEMENT
    B-TRUE : MYOPIC EYE HAVE AGAINST MOVEMENT
    C-FALSE : BECAUSE IT SHOULD BE AGINST MOVEMENT,USUALLY NO MOVEMENT DETECTED OCCUR IN EMMETROPIC EYE.
    D-FALSE : BECAUSE IT SHOULD BE AGINST MOVEMENT
    E-FALSE: BECAUSE IT SHOULD BE AGINST MOVEMENT

    FINALLY IT APPEAR HERE AFTER I RETYPE IT,HOPE YOU CAN STILL ACCEPT IT..

    ReplyDelete
  52. Question 1:

    Answers
    A: False
    B: True
    C: True
    D: False
    E: False

    Question 2:

    Answers
    A: False
    B: False
    C: False
    D: False
    E: False

    Question 3:

    Answers= Against movements

    ReplyDelete

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