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What does 20 2000 and 20 200 mean?

(4 posts)

  1. eight ball
    Member

    My Optometrist said these were my eye site reading or scores, whatever they measure eye sight with?

    Posted 1 year ago #

  2. Crazyeightys
    Member

    20 over 2000 your almost blind! 20 over 200 not as bad

    Posted 1 year ago #

  3. Dan M
    Member

    20/2000 means that to read something that someone with 20/20 vision can read at 2000 feet, you have to stand at 20 feet. 20/200 means the same, but instead of 2000 it's 200.

    Posted 1 year ago #

  4. BlkBear
    Member

    For people who have worse than 20/400 vision, a different eye chart can be used that measures beyond 20/400 vision, or, for the most accurate measurements, a Low Vision Chart can be moved closer to the patient to measure the smallest letter that they can see at a lesser distance. It is common to record vision worse than 20/400 as Count Fingers (CF at a certain number of feet), Hand Motion (HM at a certain number of feet), Light Perception (LP), or No Light Perception (NLP). The conversion of Snellen Acuity to Count Fingers Acuity is as follows:

    20/800 CF10' (Count Fingers at ten feet)
    20/1000 CF 8'
    20/1143 CF 7'
    20/1333 CF 6'
    20/1600 CF 5'
    20/2000 CF 4'
    20/2666 CF 3'
    20/4000 CF 2'
    20/8000 CF 1'

    Posted 1 year ago #

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