Soft Contacts and astigmatism

Discussion in 'Contact Lenses' started by Stuart Rose, Oct 7, 2004.

  1. Stuart Rose

    Stuart Rose Guest

    What is the maximum range of astigmatism that can be masked by a soft lens
    before a toric is needed?

    In general do certain spherical soft lenses provide better vision for people
    with astigmatism than others? Is a stiffer lens better, or a thinner/softer
    lens that draps better? I guess at the end of the day the best lens is what
    provides the best fit.

    Is the way a lens drapes the cornea the reason why different powers are
    needed between lens designs. i.e using the Ciba calculator different
    strength are required between Ciba Dallies and Ciba N&D etc.
     
    Stuart Rose, Oct 7, 2004
    #1
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  2. Stuart Rose

    LarryDoc Guest

    Objectively, about .5D for the thicker or more rigid plastics, zero for
    the most. Subjectively, using aspheric optics, about 1D horiz, .75D
    vert.
    See above.
    Yes. If the lens gets coated with debris or dehydrates or decenters,
    the vision, and comfort, suffer.
    Exactly. And using a "lens predictor" is only a starting point. It's
    best to measure the effective lens power on the eye, especially when
    dealing with a little astigmatism and with higher powers.

    --LB

    --
    Dr. Larry Bickford, O.D.
    Family Practice Eye Health & Vision Care

    The Eyecare Connection
    http://www.eyecarecontacts.com
    larrydoc at eye-care-contacts dot com (remove -)
     
    LarryDoc, Oct 7, 2004
    #2
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  3. Stuart Rose

    Stuart Rose Guest

    What is the maximum range of astigmatism that can be masked by a soft
    In terms of monthly replacement or extended wear what lenses tend to offer a
    better performace for masking astigmatism? (i.e Proclear, Acuvue, Surevue
    etc). Is there a list of which lenses are aspheric anywhere?
     
    Stuart Rose, Oct 7, 2004
    #3
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