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Contact Lenses for Keratoconus

  • Post at: July 19, 2008
  • By: dodo
  • Category: Astigmatism, Cornea, GP Contact Lenses, Keratoconus, Rigid Lenses, Soft Lenses, Visual Acuity

Keratoconus is a relatively common hereditary disorder that manifests itself in adolescence. It affects both eyes, but one eye usually progresses faster than the other. During the course of this disease the cornea changes from its round shape to that of a cone, hence the name: kera meaning “cornea” and conus meaning “cone.” The apex of the cone is thin and may become scarred. In severe cases the apex may actually perforate.

Contact Lenses CareThe poor vision brought on by keratoconus is due to a highly exaggerated form of astigmatism that is poorly corrected by glasses. Until contact lenses became available, keratoconus patients often had to be satisfied with partially corrected vision and led less-than-normal lives. But contact lenses can provide almost perfect vision in most cases and are the best means of vision correction for this disorder.

Hard contact lenses are usually used because the smooth, dome-shaped shell plus the tears beneath it provide a new smooth, round refracting surface for the eye. Because the cornea is diseased, the eye may not tolerate conventional hard lenses. In that case gas-permeable contact lenses may be prescribed instead. Soft contact lenses, in general, do not work well with keratoconic eyes. As is the case with astigmatism, the pliable material from which they are made conforms to the misshapen cornea, duplicating the refractive error. Soft contact lenses may, however, correct a portion of the faulty vision. And in some cases the patient is fitted with hard lenses on top of the soft lenses, piggyback fashion, to take advantage of the comfort of the soft lens plus the sharp visual acuity provided by the hard lens. In all cases the lenses are difficult to manufacture, and the fitting process must be extremely exact to achieve acceptable results.

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5 Responses to “Contact Lenses for Keratoconus”

  1. Contact Lens Says:
    July 23rd, 2008 at 2:30 am

    If you experience any pain or discomfort from your contacts, end use immediately and consult your eye care professional. … Contact Lens

  2. Prijent Says:
    July 26th, 2008 at 11:08 am

    Nice informations and great things and thanx for the comment

  3. Mini Contacts Says:
    August 4th, 2008 at 4:21 am

    It’s like wearing nothing in my eye, I can’t feel them once they’re in and they are very water soluble and comfortable on my eyes. … Mini Contacts

  4. Acuvue Advance Says:
    September 9th, 2008 at 8:10 pm

    Quite a few brands (including Cuvee) now have markings on the lens that can help you be sure you have it right. … Acuvue Advance

  5. GP Lenses Says:
    September 19th, 2008 at 3:54 am

    This is a thicker, more durable lens for people who have trouble with handling or tearing their lenses. … GP Lenses

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