wavefront for glasses or contacts?

Discussion in 'Glasses' started by Rev Jessie James, May 3, 2006.

  1. My lasik followups consisted of a wavefront analysis and the doctor saying "I nailed your perscription, vision doesn't get any better than that".

    Would a wavefront analysis be much more accurate in determining a patients vision and the proper corrective lenses, such as contacts or glasses?

    Is it still common practice to sit a patient behind a machine with multiple lenses and do the "is this better than this" type of routine?
    Rev Jessie James, May 3, 2006
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  2. Rev Jessie James

    Dr. Leukoma Guest

    Did you not see a phoropter hanging in your doctor's office, and has it
    really been that long ago that you've had a refraction for eyeglasses?

    Traditional refraction does a perfectly fine job of correcting lower
    aberrations of sphere and cylinder, which have large amplitudes and are
    symmetrical with respect to the visual axis. What's left over are
    termed "higher order aberrations." Most people have low amounts of
    higher order aberrations. Refractive surgery, however, increases the
    magnitude of higher order aberrations.

    The human eye is optically limited to about 20/15 resolution. The
    neural limitations are about 20/6. There are tradeoffs of having
    vision corrected to this level. Wavefront generated contact lenses and
    eyeglasses are indeed possible, but are impractical at this point in
    time because of problems of tracking and registration.

    However, simple RGP contact lenses probably do the best job of
    correcting higher order aberrations, especially those that are induced
    by LASIK.

    Dr. Leukoma, May 3, 2006
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  3. Rev Jessie James

    p.clarkii Guest

    theoretically wavefront could make a slight improvement in visual
    acuity. the problem is, with wavefront eyeglasses on, if the eye moves
    off axis in any direction then the wavefront correction is off center.
    also, with wavefront contacts on, if the lenses move or turn (they do)
    then the corrections becomes off center. in a nutshell, wavefront
    lenses won't work. and practically speaking wavefront LASIK hasn't
    proven to be any better than standard LASIK.
    p.clarkii, May 3, 2006
  4. Rev Jessie James

    Salmon Egg Guest

    Not being a vision professional, I have presumed that wavefront correction
    is merely a new technique for what, in optics, has been called figuring.
    Figuring for lenses and mirrors has been carried out by a number of
    techniques for centuries. Knife edge testing is just one of these

    To me, the term "wavefront" implies some form of interferometry. I do not
    know how such interferometry is carried out in optometric practice. How is
    the reference wavefront, against which wavefront error is measured,
    obtained. In principle the wavefront of an ingoing beam gets focussed onto
    and then scattered off of the retina to provide an outgoing wavefront
    through the eye's optical system. The two wavefronts can then be compared to
    measure the error. Is that the way it is done?

    -- Ferme le Bush
    Salmon Egg, May 3, 2006
  5. Rev Jessie James

    Dr. Leukoma Guest

    A laser beam is projected into the eye and the outgoing beam is picked
    up by thousands of tiny lenslets. Or, alternatively, a small beam is
    measured sequentially. There is an overwhelming amount of information
    available just by Googling.

    Dr. Leukoma, May 3, 2006
  6. Rev Jessie James

    Neil Brooks Guest

    But for that occasional total ophthalmoplegic that marches into your
    office looking for really crisp vision from a new pair of eyeglasses
    .... maybe we're onto something... ;-)
    Neil Brooks, May 3, 2006
  7. Rev Jessie James

    plpfoot Guest

    There is a good chance that had you not been wearing glasses the
    blow would have blinded you; you were lucky the glasses were there and
    only allowed a cut brow. Everyone playing basketball should be
    wearing protective eye gear.

    I would suggest, because of your age, that you see an
    ophthalmologist since it has been 11 years since your last check. You
    could have a blinding disease that you are unaware of.

    plpfoot, May 10, 2006
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