Friday, December 24, 2010

HOW TO CALCULATE MINIMUM SIZE UNCUT

Assalamualaikum and good morning,

Do you know about Minimum Size Uncut or MSU? Why do we need to calculate MSU?

MSU is very important information for us as clinician and Lens Company when we do lens order and edging process in Dispensing Lab... Here, I would like to share my lecture about this topic.


84 comments:

  1. Adnan B. Abdullah

    the longest radius is 2.1 cm,
    Pt's PD= 64 mm
    Frame Size= 51-17
    Metal Full Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  2. Ajmal bt. Hazizan

    the longest radius is 2.3 cm,
    Pt's PD= 68 mm
    Frame Size= 51-16
    Metal Full Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  3. Amer B. Azme

    the longest radius is 24 mm,
    Pt's PD= 22-23 mm
    Frame Size= 55-16
    Plastic Full Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  4. the longest radius is 30 mm,
    Pt's PD= 21-23 mm
    Frame Size= 54-14
    Plastic Full Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  5. Fadilah Ab Hamid...your Q in above comment column

    ReplyDelete
  6. Farihah Bt. Abdullah

    the longest radius is 23 mm,
    Pt's PD= 21-24 mm
    Frame Size= 52-17
    Plastic Full Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  7. Maryam Bt. Amiruddin

    the longest radius is 26 mm,
    Pt's PD= 32-31 mm
    Frame Size= 50-17
    Metal Full Frame.

    ReplyDelete
  8. Najwa Hanim Bt. Khasim

    the longest radius is 22 mm,
    Pt's PD= 33-30 mm
    Frame Size= 51-17
    Metal Full Frame.

    ReplyDelete
  9. Kamilatunnisak Bt. Ateman

    the longest radius is 25 mm,
    Pt's PD= 33-32 mm
    Frame Size= 51-17
    Metal Full Frame.

    ReplyDelete
  10. Muhammad Faiz B. Mohd Pauzi

    the longest radius is 22 mm,
    Pt's PD= 33-32 mm
    Frame Size= 53-16
    Metal Full Frame.

    ReplyDelete
  11. Noor Wahizatul Nasrah bt. Noor Rizan

    the longest radius is 23 mm,
    Pt's PD= 33-32 mm
    Frame Size= 53-16
    Plastic Full Frame.

    ReplyDelete
  12. Norfazrina Bt. Abdul Gaffur

    the Effective lens diameter is 46 mm,
    Pt's PD= 33-32 mm
    Frame Size= 53-16
    Plastic Full Frame.

    ReplyDelete
  13. the Effective lens diameter is 46 mm,
    Pt's PD= 30-32 mm
    Frame Size= 51-16
    Plastic Full Frame.

    ReplyDelete
  14. Norhanani Zafirah Bt. Mohamad Noor Hakim..refer to above comment

    ReplyDelete
  15. Norsyamimi Bt. Mhd Halil

    the Effective lens diameter is 42 mm,
    Pt's PD= 30-32 mm
    Frame Size= 48-15
    Plastic Full Frame.

    ReplyDelete
  16. Norsyazwani Bt. Mohd Daud

    the Effective lens diameter is 36 mm,
    Pt's PD= 55 mm
    Frame Size= 45-14
    Metal Full Frame.

    ReplyDelete
  17. Nur Amalina Bt. Zulkefli

    List other 3 importance of MSU

    the Effective lens diameter is 36 mm,
    Pt's PD= 55 mm
    Frame Size= 45-14
    Rimlon Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  18. Nur Amirah Bt. Zakaria

    the Effective lens diameter is 38 mm,
    Pt's PD= 54 mm
    Frame Size= 45-14
    Rimlon Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  19. Nur Hani Asmira Bt. Mohd Amli

    Effective lens diameter is 38 mm,
    Pt's PD= 21-24 mm
    Frame Size= 47-14
    Rimlon Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  20. Nursyahirah bt. Ibrahim

    Effective lens diameter is 38 mm,
    Pt's PD= 31-34 mm
    Frame Size= 48-16
    Rimlon Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  21. Nurul Ain Bt. Mat Juden @ Md Yudin

    Effective lens diameter is 42 mm,
    Pt's PD= 31-34 mm
    Frame Size= 52-17
    Rimless Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  22. Raja Nor Shahila Bt. Raja Mohamad

    Longest radius 24 mm,
    Pt's PD= 31-34 mm
    Frame Size= 52-17
    Rimless Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  23. Shaffrina Bt. Shaari

    Longest radius 24 mm,
    Pt's PD= 31-32 mm
    Frame Size= 52-16
    Rimless Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  24. Siti Nur Liyana Bt. Mustafar

    Longest radius 19 mm,
    Pt's PD= 32-32 mm
    Frame Size= 48-16
    Rimless Frame.

    Calculate the MSU.
    State the lens size that should be ordered.

    ReplyDelete
  25. SITI NUR LIYANA MUSTAFARDecember 24, 2010 at 2:00 PM

    salam. sir, why for my quest, the pt's PD is
    32-32mm? is it means only 32mm?? SITI NUR LIYANA MUSTAFAR

    ReplyDelete
  26. @SITI NUR LIYANA MUSTAFAR

    It means RE PD is 32mm and LE PD is 32 mm..

    To answer my question, everyone must click at 'Reply to comment' of your question..

    TQ

    ReplyDelete
  27. Hurry up guys!

    you can make a discussion here. I'm I right sir?

    You can ask any questions...heh

    ReplyDelete
  28. @azuwan

    Can Azuwan. Let's discuss and talk bout MSU

    ReplyDelete
  29. assalamualaikum..
    sir, jalan kira kena ada tak?

    ReplyDelete
  30. @The Traveler

    PD Frame = 48mm + 15mm
    = 63mm
    = 63mm/2
    = 31.5mm

    ELD = 42mm

    Decentration, d,

    RE, PD = 30mm

    d = 31.5mm - 30mm
    = 1.5mm
    = 1.5mm x 2
    = 3.0mm

    LE, PD = 32mm

    d = 31.5mm - 32mm
    = -0.5mm
    = -0.5mm x 2
    = -1.0mm
    *-ve sign indicate that PD patient is bigger than PD frame.

    Minimum Size Uncut, MSU,

    RE, MSU = ELD + d
    = 42mm + 3mm
    = 45mm
    = 45mm + glazing allowance
    = 45mm + 2mm
    = 47mm


    LE, MSU = ELD + d
    = 42mm + 1.0mm
    = 43mm
    = 43mm + glazing allowance
    = 43mm + 2mm
    = 45mm

    So, the lens size that should be ordered is 65mm.

    ReplyDelete
  31. @The Traveler

    PD Frame = 55mm + 16mm
    = 71mm
    = 61mm/2
    = 35.5mm

    ELD = longest radius x 2
    = 24mm x 2
    = 48mm

    Decentration, d,

    RE, PD = 22mm

    d = 35.5mm - 22mm
    = 13.5mm
    = 13.5mm x 2
    = 27mm

    LE, PD = 23mm

    d = 35.5mm - 23mm
    = 12.5mm
    = 12.5mm x 2
    = 25mm

    Minimum Size Uncut, MSU,

    RE, MSU = ELD + d
    = 48mm + 27mm
    = 75mm
    = 75mm + glazing allowance
    = 75mm + 2mm
    = 77mm


    LE, MSU = ELD + d
    = 48mm + 25mm
    = 73mm
    = 73mm + glazing allowance
    = 73mm + 2mm
    = 75mm

    So, the lens size that should be ordered is 80mm.

    ReplyDelete
  32. PD FRAME = 47+14
    =61/2
    =30.5 mm

    ELD : 38mm

    RE
    PD: 21mm

    DECENTRATION,d = 30.5- 21
    =9.5
    =9.5 x 2
    =19 mm

    MSU = ELD + d
    =38 + 19
    =57
    =57 + glazing allowance
    =57 + 2
    = 59 mm #

    Ordered lens, RE = 65 mm #

    LE
    PD: 24mm

    DECENTRATION,d = 30.5- 24
    =6.5
    =6.5 x 2
    =13 mm

    MSU = ELD + d
    =38 + 13
    =51
    =51 + glazing allowance
    =51 + 2
    = 53 mm #

    Ordered lens, RE = 65 mm #

    ReplyDelete
  33. @The Traveler

    1. PD Frame; 51mm +16mm = 67mm
    = 67mm / 2
    = 33.5mm

    2. ELD = 46mm

    3. RE PD = 30mm
    Decentration,d = 33.5mm-30mm
    = 3.5mm
    = 3.5mm X 2
    = 7mm

    MSU = ELD + d
    = 46mm + 7mm
    = 53mm

    MSU + glazing allowance = 53mm + 2 = 55mm

    Ordered lens should be 65mm.

    4. LE PD = 32mm

    Decentration,d = 33.5mm-32mm
    = 1.5mm
    = 1.5mm X 2
    = 3mm

    MSU = ELD + d
    = 46mm + 3mm
    = 49mm

    MSU + glazing allowance = 49mm + 2 = 51mm

    Ordered lens should be 65mm.

    ReplyDelete
  34. ELD = 2 x longest radius
    = 2 x 22
    = 44mm.

    PD Frame = (51+17)/ 2
    = 34mm.

    RE

    decentration, d = 34-33
    = 1 x 2
    = 2mm.
    MSU = ELD + d + allowing glaze
    = 44 + 2 + 2
    = 48 mm.

    LE

    decentration,d = 34-30
    = 4 x 2
    = 8mm

    MSU = ELD + d + allowing glaze
    = 44 + 8 + 2
    = 54 mm.
    The lens should be ordered is 65 mm.

    ReplyDelete
  35. @The Traveler

    ELD = longest radius x 2
    = 24mm x 2
    = 48mm

    pt's PD both eye = 63mm
    frame PD= 68mm
    frame PD each eye (LE n RE)= 68mm/2
    = 34mm

    for RE:
    decenteration
    = (34mm -31mm) x2
    = 6mm

    MSU
    = ELD + decenteration + glazing allowance
    = 48mm + 6mm + 2mm
    =58mm

    diameter lens order = 65mm

    for LE:
    = decenteration
    = (34mm -32mm) x2
    = 4mm

    MSU
    = ELD + decenteration + glazing allowance
    = 48mm + 4mm + 2mm
    =54mm

    diameter lens order = 65mm

    ReplyDelete
  36. nursyahirah ibrahimDecember 26, 2010 at 8:20 PM

    PD frame : 48+16
    = 64mm
    = 64/2
    = 32mm
    decentration d, calculated monocularly

    RE : d = 32-31
    = 1x2
    = 2mm

    LE : d = 32-34
    = 2x2
    = 4mm

    ELD = 38mm

    MSU for RE :

    MSU =ELD+d+glazing allowance

    =38+2+2
    =42mm

    MSU for LE :

    MSU =ELD+d+glazing allowance

    =38+4+2
    =44mm
    so,the lens size that should be order is 65mm

    ReplyDelete
  37. SITI NUR LIYANA MUSTAFARDecember 26, 2010 at 8:26 PM

    @The Traveler
    SALAM[ANSWER]

    ELD= 19mm x 2 = 38mm
    PD Frame = 48+16
    = 64mm

    Pt's PD = 32-32mm

    Decentration,d at RE:
    (32mm - 32mm ) x 2 = 0
    MSU for RE:
    =ELD + d + Glazing allowance
    =38mm + 0 + 2mm = 40mm

    Decentration,d at LE:
    (32mm-32mm) x 2 = 0
    MSU for LE:
    =ELD + d + Glazing allowance
    =38mm + 0 + 2mm =40mm

    so, the lens size that should be ordered for RE and LE are 65mm.

    ReplyDelete
  38. ELD= 36mm x2
    = 72mm
    Decentration (d),
    =(45mm + 14mm)-55mm
    =59mm-55mm
    =4mm (2)
    =8mm

    MSU=ELD +d
    =72mm+8mm
    =80mm

    MSU+ glazing allowance=80mm+2mm
    =82 mm
    so,lens size that should ordered is 85mm

    ReplyDelete
  39. frame size:53mm+16mm=69mm
    69mm/2=34.5mm
    ELD: 46mm

    RE PD:33mm
    decentration:
    34.5mm-33mm
    =1.5mm
    =1.5mmx2
    =3mm
    MSU:
    ELD+decentration+allowance glaze
    46+3+2=51mm

    ordered lens should be 65mm

    LE PD:32mm
    decentration:
    34.5mm-32mm
    =2.5mm
    =2.5mmx2
    =5mm
    MSU:
    ELD+decentration+allowance glaze
    46+5+2=53mm

    ordered lens should be 65mm

    ReplyDelete
  40. @The Traveler

    ELD= radius x 2
    = 26mm x 2
    = 52mm

    PD frame= (50mm + 17mm)/2
    = 67mm/2
    =33.5mm

    Decentrati0n,d:
    RE= (33.5mm-32mm) x 2
    = 1.5mm x 2
    = 3.00mm

    LE= (33.5mm-31mm) X 2
    = 2.5mm X 2
    = 5.00mm

    MSU =ELD + d + glazing allowance
    f0r the RE,MSU= 52mm + 3mm + 2mm
    =57mm
    for the LE,MSU= 52mm + 5mm + 2mm
    =59mm

    s0,the lens size that sh0uld be 0rdered are 65mm.

    ReplyDelete
  41. ELD: 36mm
    Pt's PD: 55mm
    frame size:45mm+14mm=59mm

    decentration:
    59mm-55mm
    =4mm
    =4mmx2
    =8mm
    MSU:
    ELD+decentration+allowance glaze
    36+8+2=46mm

    ordered lens should be 65mm

    ReplyDelete
  42. For RE;
    ELD; 30 x 2 = 60mm
    Distance nasal-box centre = 34mm
    Distance nasal-patient's pupil=21mm
    Decentration ; (34 - 21)x2 = 26mm
    MSU; ELD+decentration+glazing allowance, 60+26+2 = 88mm

    The lens should be order is 85mm because the plastic full frame can be adjusted which is slightly stretch and shrunken.


    For LE;
    ELD; 30 x 2 = 60mm
    Decentration ; (34-23)x2 = 22mm
    MSU; 60+22+2 = 84mm

    In this case, the lens should be ordered is 85mm

    ReplyDelete
  43. Importance of Minimum Size Uncut(MSU)

    1.to know the required minimum size of lens that will be ordered fron manufacturer.

    2.to make sure that the lens fits according to the size of spectacle design.

    3.to ensure the effective diameter of ordered lens.

    4.to ensure the ordered lens not to small and not to big to fit into the frame.

    5.to make sure when we want to cut the lens it is enough for adjustment.

    6.to certify the exact size of lens will not result in wasting as big/large uncut lens is more costly.

    7.to make certain if we need special order due to unique frame from the manufacturer.

    8.to make it easier for decentration.

    9.to make it easier to dispense using the machine.

    10.to ensure the lens ordered fits with patient's frame without having problem with pupillary distance(PD) and optical center(OC).

    ReplyDelete
  44. This comment has been removed by the author.

    ReplyDelete
  45. raja nor shahila raja mohamadDecember 26, 2010 at 9:24 PM

    ELD: 2x24mm=48mm
    PD Frame: (52mm + 17mm)/2
    = 34.5mm

    RE
    decentration,d : 34.5-31
    =3.5mm
    3.5mm x 2 = 7mm
    MSU = ELD + d + 2
    = 48mm + 7mm + 2mm = 57mm

    lens size that should be ordered: 65mm

    LE
    decentration,d: 34.5-34
    = 0.5mm
    0.5mm x 2 = 1mm
    MSU: ELD + d + 2mm
    48mm + 1mm + 2mm = 51 mm
    lens size that should be ordered is 65mm

    ReplyDelete
  46. sir,the range of uncut lens size is65mm-85mm right? is there any MSU value which is greater than 85mm? and if yes,the lenses should be ordered as special order?

    ReplyDelete
  47. This comment has been removed by the author.

    ReplyDelete
  48. Frame's PD = 51mm + 16mm
    = 67mm

    ELD = 2.3cm x 2
    = 23mm x 2
    = 46mm

    decentration (d) = Frame's PD - Pt's PD
    = 67mm - 68mm
    = -1mm
    = -1mm x 2
    = -2mm (negative sign indicating pt's PD is bigger than the Frame's PD)

    MSU = ELD + d
    = 46mm + 2mm
    = 48mm + glazing allowance
    = 48mm + 2mm
    = 50mm

    The lens size that should be ordered is 65mm.

    ReplyDelete
  49. @The Traveler


    Frame’s PD = (52 mm + 17 mm)/2
    = 69 mm/2
    = 34.5

    ELD = longest radius x 2
    = 23 mm x 2
    = 46 mm

    RE; Pt’s PD = 21 mm
    Decentration = (Frame’s PD-Pt’s PD) x 2
    = (34.5 mm – 21 mm) x 2
    = 13.5 mm x 2
    = 27 mm

    LE; Pt’s PD = 24 mm
    Decentration = (Frame’s PD-Pt’s PD) x 2
    = (34.5 mm – 24 mm) x 2
    = 10.5 mm x 2
    = 21 mm

    Minimum Size Uncut (MSU)
    = ELD + decentration + glazing allowance
    RE; MSU = 46 mm + 27 mm + 2 mm
    = 75 mm
    LE; MSU = 46 mm + 21 mm + 2 mm
    = 69 mm


    Lens size that should be ordered; RE = 75 mm
    LE = 70 mm

    ReplyDelete
  50. This comment has been removed by the author.

    ReplyDelete
  51. 1. PD Frame; 52mm +17mm = 69mm
    = 69mm / 2
    = 34.5mm

    2. ELD = 42mm

    3. RE- PD = 31mm
    Decentration , d = 34.5mm-31mm
    = 3.5mm
    = 3.5mm X 2
    = 7mm

    MSU = ELD + d
    = 42mm + 7mm
    = 49mm

    MSU + glazing allowance = 49mm + 2mm = 51mm

    Ordered lens should be 65mm.

    4. LE PD = 34mm

    Decentration,d = 33.5mm-34mm
    = 0.5mm
    = 0.5mm X 2
    = 1mm

    MSU = ELD + d
    = 42mm + 1mm
    = 43mm

    MSU + glazing allowance = 43mm + 2 = 45mm

    Ordered lens should be 65mm.

    ReplyDelete
  52. ELD
    = longest radius x 2
    = 23mm x 2
    = 46mm

    PD frame
    = (53mm + 16mm)/2
    = 68mm/2
    = 34mm

    Decentration, d

    RE,PD = 33mm
    d = PD frame-RE(PD)
    = 34mm-33mm
    = 1mm x 2
    = 2mm

    RE, MSU
    = ELD + d + glazing allowance
    = 46mm + 2mm + 2mm
    = 50mm

    Lens size should be ordered is 65mm.

    LE, PD = 32mm
    d = 34mm - 32mm
    = 2mm x2
    = 4mm

    LE, MSU
    = 46mm + 4mm + 2mm
    = 52mm

    Lens size should be ordered is 65mm.

    ReplyDelete
  53. ELD = 38mm
    PD = 54mm
    Frame = 45 mm + 14 mm
    =59 mm
    decentration = 59mm-54mm
    = 5mm x 2
    =10mm
    MSU= decentration + ELD + glazing allowance
    = 10 mm + 38 mm + 2 mm
    = 50 mm
    Lens that should be order is 65mm

    ReplyDelete
  54. This comment has been removed by the author.

    ReplyDelete
  55. ELD = longest radius x 2
    = 22 x 2
    = 44 mm

    Decentration = [half frame size - monocular PD]x 2
    = [(53+16)/2 - monocular PD]x 2

    MSU = ELD + decentration + glazing allowance

    RE - decentration in
    RE decentration = [half frame size - monocular PD]x 2
    = [(69mm/2) - 33mm] x 2
    = 3 mm

    RE MSU = ELD + RE decentration + glazing allowance
    = 44mm + 3mm + 2mm
    = 49mm

    # the lens size that should be ordered for RE = 65mm


    LE - decentration in
    LE decentration = [half frame size - monocular PD]x 2
    = [(69mm/2) - 32mm] x 2
    = 5 mm

    LE MSU = ELD + LE decentration + glazing allowance
    = 44mm + 5mm + 2mm
    = 51mm

    # the lens size that should be ordered for LE = 65mm

    ReplyDelete
  56. @The Traveler

    Kamilatunnisak 's Answer

    ELD = double the longest radius
    = 25 x 2
    = 50 mm

    ELD+glazing allowance 2mm = 50 + 2
    = 52mm

    PD Frame = (51 + 17) / 2
    = 34 mm

    RE PD = 33 mm

    RE Decentration = PD Frame - RE PD
    = 34 - 33
    = 1 mm

    double RE decentration = 1 x 2
    = 2 mm

    RE MSU = (ELD + glazing allowance)
    + double RE decentration
    + glazing allowance 2mm
    = 52 + 2 + 2
    = 56 mm

    LE PD = 32 mm

    LE decentration = PD frame - LE PD
    = 34 - 32
    = 2 mm

    Double LE decentration = 2 x 2
    = 4 mm

    LE MSU = (ELD + glazing allowance)
    + double LE decentration
    + glazing allowance 2mm
    = 52 + 4 + 2
    =58 mm

    MSU for RE is 56 mm and LE is 58 mm. Thus, the lens size for RE and LE that should be ordered are 65 mm.

    ReplyDelete
  57. sorry sir..below is latest answer for my question
    ELD: 36mm
    PD: 55mm
    Frame: 45mm + 14mm
    =59mm
    Decentration (d),
    =59mm-55mm
    =4mm (2)
    =8mm

    MSU= d+ELD+glazing allowance
    = 8mm+36mm+2mm
    =46mm
    so, the lens should be ordered is 65mm

    ReplyDelete
  58. Metal Full Frame

    Longest radius = 21mm
    Patient's diameter = 64mm
    Effective Lens Diameter (ELD) = longest radius x 2
    = 21 x 2
    = 42 mm

    Decentration (D)
    = [frame size - Patient's PD]x 2
    = [(51+17) - 64]x 2
    = [68 - 64]x 2
    = 8mm (+ sign: pt's PD is smaller than the Frame's PD: decentration in)

    MSU = ELD + D + glazing allowance
    = 42 + 8 + 2
    = 52mm

    So, the lens size that should be ordered = 65mm #

    ReplyDelete
  59. @mimie.amer

    W'slm

    yup..have to show the calculation step

    ReplyDelete
  60. PD pt: 72 mm,
    Frame PD: 75 mm

    Is same if we do like this?

    75-72=3mm x 2=6 mm -wrong

    3/2=1.5 mmx2= 3 mm Correct

    ReplyDelete
  61. @Norfazrina Binti Abdul Gaffur
    frame size:53mm+16mm=69mm
    69mm/2=34.5mm
    ELD: 46mm

    RE PD:33mm
    decentration:
    34.5mm-33mm
    =1.5mm
    =1.5mmx2
    =3mm
    MSU:
    ELD+decentration+allowance glaze
    46+3+2+1=52mm

    ordered lens should be 65mm

    LE PD:32mm
    decentration:
    34.5mm-32mm
    =2.5mm
    =2.5mmx2
    =5mm
    MSU:
    ELD+decentration+allowance glaze
    46+5+2+1=54mm

    ordered lens should be 65mm

    ReplyDelete
  62. SITI NUR LIYANA MUSTAFARDecember 27, 2010 at 1:02 PM

    @SITI NUR LIYANA MUSTAFAR
    CORRECTION

    1.ELD= 19mm x 2 = 38mm
    PD Frame = 48+16
    =64mm/2 = 32mm

    Pt's PD = 32-32mm

    2.Decentration,d at RE:
    (32mm - 32mm ) x 2 = 0
    MSU for RE:
    =ELD + d
    =38mm + 0 = 38mm

    3.Decentration,d at LE:
    (32mm-32mm) x 2 = 0
    MSU for LE:
    =ELD + d
    =38mm + 0 = 38mm

    4.so, the lens size that should be ordered for RE and LE are 65mm if the lens needed is plus power. however, if the lens needed is minus power, the lens size that should be ordered is 70mm.
    THANK YOU

    ReplyDelete
  63. @<a href="#c609957205151570069"

    correction towards for my answer:

    MSU for RE:
    =ELD + decenteration
    =48mm + 6mm
    =54mm
    (because it is rimless frame, so no need to add the glazing allowance)

    diameter lense order =
    1)if it is in the range of:

    *sph:+4.00D - -6.00D
    cyl: <-2.00D

    minus lens is 70mm
    plus lens is 65mm

    if the lens is not in the above* range both minus and plus lens is order in 65mm in diameter.

    MSU for LE:
    =ELD + decenteration
    = 48mm + 4mm
    = 52mm
    diameter lens order same as for the RE.

    ReplyDelete
  64. @Norhanani Zafirah Bt Mohamad Noor Hakim

    Correction;

    RE

    MSU = ELD + decentration + glazing allowance + 1mm (for plastic full frame)

    = 46mm + 7mm + 2mm + 1mm
    = 56mm

    Lens that should be ordered is 65mm.

    LE

    MSU = ELD + decentration + 2mm + 1mm (for plastic full frame)

    = 46mm + 3mm + 2mm + 1mm
    = 52mm

    Lens that should be ordered is 65mm.

    ReplyDelete
  65. @fadilah hamid


    Correction;

    RE

    MSU = ELD+Decentration+glazing allowance+1mm, 60+26+2+1 = 89mm

    The lens should be ordered is 90mm.

    LE

    MSU = ELD+decentration+glazing alllownace+1mm, 60+22+2+1 = 85mm

    The lens should be ordered is 85mm.

    ReplyDelete
  66. CORRECTION

    RE, MSU
    = ELD + d + glazing allowance
    = 46mm+ 2mm + 2mm + 1mm (for full plastic frame)
    = 51mm

    LE, MSU
    =ELD + d + glazing allowance
    = 46mm + 4mm + 2mm + 1mm (for full plastic frame)
    =53mm

    The lens size should be ordered for both eyes is still 65mm.

    ReplyDelete
  67. @The Traveler

    correction;

    Frame's PD = 51mm + 16mm
    = 67mm

    ELD = longest radius x 2
    = 2.3cm x 2
    = 23mm x 2
    = 46mm

    decentration (d) = (Frame's PD - Pt's PD)/2
    = (67mm - 68mm)/2
    = -0.5mm
    = -0.5mm x 2
    = -1mm (negative sign indicating pt's PD is bigger than frame's PD)

    MSU (RE)= MSU (LE)
    = ELD + d + glazing allowance
    = 46mm + 1mm + 2mm
    = 49mm

    The lens size that should be ordered for each eye; LE and RE is 65mm

    ReplyDelete
  68. CORRECTION

    ELD =38 mm
    PD = 54 mm
    FRAME =45 +14
    =59 mm
    Decentration = 59 -54
    = 5 mm
    =5/2
    = 2.5 x 2
    =5 mm
    MSU = ELD + Decentration + glazing
    allowance
    = 38 mm + 5 mm+ 2 mm
    = 45 mm
    Lens that should be order is 65 mm

    ReplyDelete
  69. @mimie.amer

    correction for MSU.

    MSU = ELD + d + glazing allowance + 1mm for full plastic frame

    so,

    RE, MSU = 42mm + 3mm + 2mm + 1mm
    = 48mm

    LE, MSU = 42mm + 1mm + 2mm + 1mm
    = 46mm

    Therefore, the lens size that should be ordered for both RE and LE are 65mm.

    ReplyDelete
  70. @Amer Azme

    correction for MSU.

    MSU = ELD + d + glazing allowance + 1mm for full plastic frame

    so,

    RE, MSU = 48mm + 27mm + 2mm + 1mm
    = 78mm

    LE, MSU = 48mm + 25mm + 2mm + 1mm
    = 76mm

    Therefore, the lens size that should be ordered for both RE and LE are 80mm.

    ReplyDelete
  71. Correction:

    ELD = longest radius x 2
    30mm x 2 = 60mm
    frame PD = 54+14 = 68mm
    RE;
    decentration = (68/2)- 21
    = 13mm x 2
    = 26mm
    LE;
    decentration = (68/2)- 23
    = 11mm x 2
    = 22mm

    MSU = ELD + glazing allowance + d
    RE;
    MSU = 60 + 2 + 26
    = 88mm
    since the the frame is plastic full frame,so:
    88mm + 1mm = 89mm

    The lens size is out of uncut size range,so, we need to make special order from supplier or we can consult the customer to choose smaller frame size.

    LE;
    MSU = 60 + 2 + 22
    = 84mm
    the frame is plastic full frame,so:
    84mm + 1mm = 85mm

    The lens should be ordered is 85mm

    ReplyDelete
  72. @Nur Amalina Zulkefli

    to cut cost as well.

    make sure we order the correct lens diameter for our patient. according to MSU.

    If our MSU is 60mm, we have to order lens with diameter of 60mm (only if the manufacturer produce this diameter), if not, you can order lens with diameter of 65mm, do not order lens with 70 or 75mm! (you can do so if only 65mm lens is not available).
    larger the diameter, the great price it will be.

    it it clear to you guys?

    ReplyDelete
  73. @nurul_ain@nurul_ain
    correction:
    for rimless frame:
    (RE)
    MSU =ELD+decentration
    42mm+7mm=49mm
    LENS SHOULD BE ORDERED=65mm

    (LE)
    MSU =ELD+decentration
    42mm+1mm=43mm
    LENS SHOULD BE ORDERED=65mm

    ReplyDelete
  74. @farihah abdullah

    CORRECTION

    Frame’s PD = (52 mm + 17 mm)/2
    = 69 mm/2
    = 34.5

    ELD = longest radius x 2
    = 23 mm x 2
    = 46 mm

    RE; Pt’s PD = 21 mm
    Decentration = (Frame’s PD-Pt’s PD) x 2
    = (34.5 mm – 21 mm) x 2
    = 13.5 mm x 2
    = 27 mm

    LE; Pt’s PD = 24 mm
    Decentration = (Frame’s PD-Pt’s PD) x 2
    = (34.5 mm – 24 mm) x 2
    = 10.5 mm x 2
    = 21 mm

    Minimum Size Uncut (MSU)
    = ELD + decentration + glazing allowance
    RE; MSU = 46 mm + 27 mm + 2 mm + 1mm
    = 76 mm
    LE; MSU = 46 mm + 21 mm + 2 mm + 1mm
    = 70 mm


    Lens size that should be ordered; RE = 80 mm
    LE = 70 mm

    ReplyDelete
  75. Nur Amalina ZulkefliDecember 27, 2010 at 2:06 PM

    @The Traveler
    new knowledge..

    pt's pd:55mm
    frame size:45-14
    ELD:36mm

    decentration RE:
    59-55=4decentration RE:
    59-55=4
    4/2=2
    2X2=4

    MSU = ELD + Decentration + Glazing allowance
    = 36 + 4 + 2
    = 42mm


    decentration LE:
    59-55=4
    4/2=2
    2X2=4

    MSU = ELD + Decentration + Glazing allowance
    = 36 + 4 + 2
    = 42mm

    The lens should be ordered for both eyes are 65mm.

    ReplyDelete
  76. Sir, just ignore the comment at 1.22pm. Thank you.

    ReplyDelete
  77. raja nor shahila raja mohamadDecember 27, 2010 at 2:20 PM

    @raja nor shahila raja mohamad
    correction 4 MSU :
    since it is a rimless frame,no need to add 2mm glazing allowance.
    ELD: 48mm
    MSU: ELD+ (dX2)
    RE: 48mm + (3.5mm x 2) = 55mm
    LE: 48mm + (0.5mm x 2) = 49mm
    therefore, lens size that should be ordered is 65mm.

    ReplyDelete
  78. you can read further on the lens diameter available in the market. Not all manufacturers produce the same lens diameter.

    Common diameter available are 65mm, 70mm and 75mm (according to this manufacturer: ILT Optics Sdn. Bhd)

    ReplyDelete

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