Eye exam - near/far vision

Discussion in 'Eye-Care' started by Richard Fangnail, Sep 2, 2008.

  1. When you get an exam for glasses, does the test give the doctor one
    number for near vision, and one number for far vision?

    If so, how does the doctor then decide what to write for Cylinder, if
    the two are different?
    Richard Fangnail, Sep 2, 2008
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  2. When they make bifocals, what do they use for the two different parts?
    That is, how do you write an Rx for bifocals? From what you say,
    Cylinder would be the same for near and far.
    Richard Fangnail, Sep 2, 2008
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  3. Richard Fangnail

    Mark A Guest

    He is wrong. The Rx has the distance vision (typically measured at 20 ft)
    and there is an "add" power specification that only applies to the bottom
    reading area of the lens (so the reading area is the sum of the distance
    plus the add power).
    Mark A, Sep 2, 2008
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