Does Lens size matter?

Discussion in 'Optometry Archives' started by Mike Getz, Aug 4, 2004.

  1. Mike Getz

    Mike Getz Guest

    I have always worn glasses w/ rather large frames/lenses (Bifocals).
    It seems the "style" now is much smaller frames and lenses. If I get
    new frames that are smaller, will I notice any difference in my vision
    or using the glasses. It would seem the the bifocal part would be very
    small and it would not be easy to use.

    Thanks for your thoughts
    Mike Getz, Aug 4, 2004
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  2. Mike Getz

    Vile Guest

    I went from large lenses to small lenses and it does take getting used
    to. But I believe that the eye is an adaptive organism, given time
    you won't notice. Yep... you won't notice your eyes getting used to
    the staircase myopia that glasses produce.
    Vile, Aug 6, 2004
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  3. Mike Getz

    Dr. Leukoma Guest

    (Vile) wrote in
    Funny to see who believes in minus lens-induced staircase myopia and who

    Dr. Leukoma, Aug 6, 2004
  4. Mike Getz

    Cathy Hopson Guest

    Only those who've "seen" it. You're right, not everybody. Only those
    who've been told by their OD, "Your lenses are not too strong. You'll adapt
    in a few days." Sure enough, they do.

    Cathy Hopson, Aug 6, 2004
  5. Mike Getz

    Cathy Hopson Guest

    Yup. They got what they asked for.
    I imagine the greater amount of accommodative demand hands the new burden
    off to axial length as soon as axial length will take it.

    Cathy Hopson, Aug 6, 2004
  6. Mike Getz

    Dr. Leukoma Guest

    Yes, but when accommodative demand is reduced with bifocals, it doesn't
    seem to matter. Maybe you should stick with one of those new paradigms,
    like off-axis blur.

    Dr. Leukoma, Aug 6, 2004
  7. Mike Getz

    Cathy Hopson Guest

    Now I have to imagine someone saying his bifocal add is too strong? If it's
    too strong for reading, then I imagine the greater amount of accommodative
    demand hands the new burden off to axial length as soon as axial length will
    take it.

    Off-axis refraction is less than central refraction for the myope. The
    off-axis overcorrection is worse.

    Cathy Hopson, Aug 6, 2004
  8. Mike Getz

    Dr. Leukoma Guest

    I profess not to understand what you are saying. Accommodation, thus far,
    appears not to be the prime suspect.

    Dr. Leukoma, Aug 7, 2004
  9. Mike Getz

    Cathy Hopson Guest

    Correct. Accommodation is not the prime suspect. Whether fully
    accommodated or totally relaxed, the shape of the image coming past the
    posterior surface of the crystalline lens has to match the shape of the
    retina for there to be no blur. "One quarter less was blurry" for central
    vision, but the elongated eye's peripheral vision will have hyperopic blur.
    Bifocals only add to the peripheral confusion. The person "adapts" quickly,
    but the retina will still take into account all the confusion as it reshapes
    itself to the new visual input. The time spent on near vs. far and central
    vs. peripheral, behind minus vs. plus vs. plano vs. nothing, influences the
    retina as to what new shape to take and how to direct eye growth to support
    the new shape.

    Accommodation does not cause image shape to mismatch retina shape. It does
    not cause blur, retinal reshaping, or eye growth. It merely takes up the
    retina's slack, bringing into focus what it can as needed. With each new
    pair of stronger lenses, off-axis blur increases, the patient adapts,
    retinal reshaping continues, and the eye grows to match the retina's new
    shape. Hyperopic defocus (the cause of accommodation) is the culprit, even
    when central vision is not overcorrected.

    Cathy Hopson, Aug 8, 2004
  10. You speak too difficult.
    Indeed you wear glasses and suffer form a serious imperfect sight
    Only a strained mind can find interest in these long discussions,
    When you will know how a cure can be accomplished by means of rest
    methods and tricks, all this jargon will go down the drain.

    But very few people are interested in getting a cure!
    Rishi Giovanni Gatti, Aug 11, 2004
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