RGP lens size

Discussion in 'Optometry Archives' started by Woon Wai Keen, Oct 14, 2005.

  1. I was fitted with RGPs yesterday (my first contact lenses).

    I noticed that when I'm outdoors, I can clearly notice the edges of my
    RGPs. Is this normal? Or are they supposed to cover my whole field of
    Woon Wai Keen, Oct 14, 2005
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  2. I actually notice it more in bright light (since I see shimmer off the
    edges). Yes, they're noticable notably in one direction - on the outside.

    Thanks, I'll see how it goes before my next visit to the optometrist in
    two weeks time.
    Woon Wai Keen, Oct 14, 2005
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  3. Woon Wai Keen

    Neil Brooks Guest

    Playing off of Mike's point: depending on what you 'see,' this may be
    indicative of a fit issue (too much movement).

    I always saw the tops of mine. They were riding too low (sloppy fit
    for a guy with mucho astigmatism isn't a really happy thing). Change
    in the base curve and away ... we ... go ....

    Good luck!
    Neil Brooks, Oct 14, 2005
  4. Woon Wai Keen

    Quick Guest

    Mention it to your doc when you go back.
    There are some standard sizes and then a lot of
    interacting variables. Diameter of the lens will
    interact with your lids differently, effect wetting,
    O2 to the eye, etc. I'm being fitted as well. The
    first set seemed a bit small to the point that
    (outdoors in the sunshine especially) it had
    the effect of looking through a "viewer" and
    at night I was getting some pretty significant
    edge effects from light sources to the sides
    -- right hand side mirror was particularly bad.

    On the second set now and the doc had them
    made larger. The effect is much less. So I think
    we've nailed the size if we haven't introduced
    other problems with it. I gather that with RGPs
    you will always be able to see the (outside) edges
    in your peripheral vision if you concentrate
    on it. I think it's much like the dozens of floaters
    that I don't see unless I look for them.

    Quick, Oct 14, 2005
  5. Woon Wai Keen

    Dr. Leukoma Guest

    There is no limitation to size. I regularly fit RGP's that are the
    size of soft lenses. With those, there is no translational movement,
    and the optic zones can be made quite large.

    Dr. Leukoma, Oct 14, 2005
  6. Woon Wai Keen

    Quick Guest

    Depends right? There is the oxygen thing (for more than
    just comfort). In my case the larger ones are more comfortable
    because with the smaller ones my upper eyelids were just
    above and "bumped" over the top edge on blink (thick lenses).
    I think that also caused the lid to "grab" the lens for a bit too
    much translation on blink and sort of hold on to them for a
    slow recovery. The slightly larger ones have the top edge
    sitting just under the top lid. More comfortable, less action
    on blink and faster recovery. We have yet to see if it has
    adversly effected translation on down gaze to get to the
    center and bottom segments.

    Quick, Oct 14, 2005
  7. Woon Wai Keen

    Dr. Leukoma Guest

    Yes, well the dk/t is something in the neighborhood of 100, and there
    is a fenestration (hole) in the lens. So, I'm thinking that the oxygen
    flux is as good or better than many of the soft lenses on the market.

    Dr. Leukoma, Oct 14, 2005
  8. Just came back from the cinema. It's much more distracting in there; a
    faint halo floating about!
    Woon Wai Keen, Oct 16, 2005
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