Translation Please!

Discussion in 'Optometry Archives' started by Ms.Brainy, Mar 27, 2007.

  1. Ms.Brainy

    Ms.Brainy Guest

    Can anybody tell me the Rx required to bring 20/60 visual acuity to

    Can anybody provide the formula for such translation?
    Ms.Brainy, Mar 27, 2007
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  2. Ms.Brainy

    otisbrown Guest

    Dear Ms. Brainy,

    There is no "formula" for translating a refracitve STATE to
    a Snellen reading.

    The best way to check would be to have your
    own trial-lens kit.

    Then, reading at 20/60, you would use stronger minus lenses
    in -1/4 diopter steps until the 20/20 line cleared.

    The APPROXIMATE value would be about -1.25 diopters,
    but it could be from -2.0 to -1.0 diopters.

    It is also affected by the illumination of the Snellen.


    otisbrown, Mar 27, 2007
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  3. Ms.Brainy

    Ms.Brainy Guest

    I think I begin to understand... Boy, it's more comlicated than I
    have imagined!

    If indeed I understand, when you mention the inability of the brain to
    process disparity between the 2 eyes when it's more than 2 diopters,
    you really relate only to the Rx, not to the resulted vision acuity.
    Am I correct?
    Ms.Brainy, Mar 27, 2007
  4. not really.
    rx could be myopia, hyperopia, astigmatism and astigmatism at
    different angles will affect acuity differently.
    pupil size is a factor too.
    so is eye health.
    michael toulch, Mar 27, 2007
  5. Ms.Brainy

    Dan Abel Guest

    Only Otis. Nobody else can do this.

    There are many conditions that will cause a tested state of 20/60. Some
    can be corrected with various prescriptions, some require surgery and
    some are not correctable at all.

    If you know that you are nearsighted, Otis can help you. Otherwise, he
    won't believe you.
    Dan Abel, Mar 30, 2007
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