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-   -   How to understand eyesight number (https://www.askmehelpdesk.com/showthread.php?t=88432)

  • May 2, 2007, 08:36 AM
    r shaikh
    How to understand eyesight number
    What does this mean in terms of eyesight - CYL -R--2.25, L - -2.75
  • Mar 16, 2008, 01:45 AM
    ChihuahuaMomma
    Cyl is the cylinder. If its minus it means you are nearsighted, if its plus you are farsighted.

    R or OD means right eye, L or OS means left.

    -2.25 is your prescription for your right eye.
    -2.75 is your prescription for your left eye.
  • Mar 19, 2008, 12:13 AM
    supriya _82
    ChihuahuaMomma is right. A bit of extra info - the unit of the numbers is diopters (eg -2.25 diopters) Though not mentioned it is universally applicable.
    Also since you have Cylindical correction, the prescription should also mention the axis which is not mentioned on yours.

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