Warning! Do not leave contacts in your eyes for a month! Neovasculation damage!

Discussion in 'Contact Lenses' started by acemanvx, Aug 5, 2006.

  1. acemanvx

    acemanvx Guest

    acemanvx, Aug 5, 2006
  2. acemanvx

    Dr. Leukoma Guest

    Yet another "Aceism."

    The patient in question was shown wearing an RGP lens. The vessels
    were extending from the temporal limbus to the edge of the contact
    lens, and not underneath the lens. Therefore, the mechanism was most
    likely not hypoxia, or lack of oxygen, but dryness resulting from
    improper lubrication of the corneal surface in that area. This is a
    typical location for exposure keratitis in a patient wearing a small
    corneal lens. If the problem had been caused by hypoxia -- or lack of
    oxygen, the vessels would have extended beneath the surface of the
    lens, and those vessels would have been widely distributed in a
    configuration known as pannus.

    There are three brands of contact lenses approved for 30 days of
    continuous wear by the FDA. Those are Menicon Z, Purevision, and Focus
    N&D. All of them have sufficient oxygen permeability NOT to cause
    hypoxia-related neovascularization. However, staining in the 3:00 -
    9:00 regions are characteristic of smaller corneal lenses, not soft

    Unfortunately, Ace gets it wrong so often, that nearly half the
    responses in any group in which he participates are corrections to his
    posts. He is the embodiment of the phrase, a little knowledge is a
    dangerous thing. I sure hope he doesn't play with matches.

    Dr. Leukoma, Aug 5, 2006
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