Contact Lens Fitting?

Discussion in 'Contact Lenses' started by Bob, Nov 16, 2004.

  1. Bob

    Bob Guest

    Is there a relationship between the Sphere (-8.00, -10.00 etc), Base
    Curve and/or Diameter of a contact lens in terms of its ability to
    correct vision?

    I ask because normally I wear B&L PureVisions with my right eye at Rx
    -10.00, BC 8.6, Dia 13.8 and find this to be pretty good. But recently
    had an emergency situation where I tried an Acuvue daily at Rx -10.00,
    BC 8.5, Dia 14.2 and couldn't see very well at all. Just for the heck of
    it I decided to try the same Acuvue in my left eye Rx of -8.00 (same BC,
    Dia) in my right eye and found my vision much closer to the B&Ls.
    Bob, Nov 16, 2004
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  2. Bob

    LarryDoc Guest

    With soft contact lenses, base curve and diameter have little effect on
    resultant optics, assuming the fit is correct. But the rigidity of the
    material, optic zone diameter and surface stability certainly does,
    especially when astigmatism (caused by cornea) is present.

    The power number on the package is not the issue, What is important is
    instead the resultant power number that provides the best vision.

    LarryDoc, Nov 17, 2004
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