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Opthalmic Frames
Practice Exercises

Determine the amount of horizontal decentration required for the following:
(answers on next page)

  1. "A" measurement = 54
    DBL = 16
    PD = 62

  2. "A" measurement = 42
    DBL = 14
    PD = 50

  3. "A" measurement = 50
    DBL = 16
    PD = 66

  4. "A" measurement = 58
    DBL = 22
    PD = 64

    Determine the "theoretical" minimum blank size for each of the following:

  5. "A" measurement = 58
    DBL = 18
    PD = 68
    ED = 60

  6. "A" measurement = 52
    DBL = 20
    PD = 60
    ED = 54

  7. "A" measurement = 56
    DBL = 16
    PD = 64
    ED = 59

  8. "A" measurement = 48
    DBL = 14
    PD = 50
    ED = 50

    Calculate vertical decentration of the bifocal segment for the following:

  9. "B" Measurement = 52
    Seg height = 23

  10. "B" Measurement = 48
    Seg height = 24

  11. "B" Measurement = 50
    Seg height = 28

  12. "B" Measurement = 46
    Seg height = 19

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