Lenticular astigmatism

Discussion in 'Optometry Archives' started by toby.hobson, Nov 2, 2005.

  1. toby.hobson

    toby.hobson Guest

    Hi

    I have a lenticular astigmatism. I also work in IT and therefore spend
    a lot of time looking at a PC monitor. I have noticed that if I spend
    less time using my PC (e.g. if I am between contracts) my vision seems
    to improve slightly. Equally when I start using the PC for long periods
    again my vision seems to deteriorate.

    My question is therefore: is there any evidence that using a PC for
    extended periods of time increases lenticular astigmatism?

    Thanks

    Toby
     
    toby.hobson, Nov 2, 2005
    #1
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  2. toby.hobson

    p.clarkii Guest

    when a person focuses at near objects (e.g. computer screen) for a
    prolonged period of time, they may develop increased ciliary muscle
    tone. (the ciliary muscle is inside your eye and attached to your
    lens. its activity causes the lens to change its shape so objects at
    near are in focus instead of far away). the increased tone of the
    muscle, i.e. its inability to relax completely, may cause your distance
    vision to be blurry for a short time. after you quit working at near
    for excessive periods and resume a more normal visual pattern the
    muscle relaxes to its normal state and your distance vision appears
    better. this is commonplace and is probably what you are noticing.
    this effect is called a lot of things, and I use the term
    "pseudomyopia" to describe it. it probably isn't related to lenticular
    astigmatism.
     
    p.clarkii, Nov 2, 2005
    #2
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