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  2. Scleral lens - Wikipedia

    en.wikipedia.org/wiki/Scleral_lens

    Scleral lenses may be used to improve vision and reduce pain and light sensitivity for people with a growing number of disorders or injuries to the eye, such as severe dry eye syndrome, microphthalmia, keratoconus, [1] corneal ectasia, Stevens–Johnson syndrome, Sjögren's syndrome, [2] aniridia, neurotrophic keratitis (anesthetic corneas), complications post-LASIK, higher-order aberrations ...

  3. Effects of long-term contact lens wear on the cornea - Wikipedia

    en.wikipedia.org/wiki/Effects_of_long-term...

    Long-term contact lens use can lead to alterations in corneal thickness, stromal thickness, curvature, corneal sensitivity, cell density, and epithelial oxygen uptake. . Other structural changes may include the formation of epithelial vacuoles and microcysts (containing cellular debris), corneal neovascularization, as well as the emergence of polymegethism in the corneal endoth

  4. Macular degeneration - Wikipedia

    en.wikipedia.org/wiki/Macular_degeneration

    It most commonly occurs in people over the age of fifty and in the United States is the most common cause of vision loss in this age group. [1] [3] About 0.4% of people between 50 and 60 have the disease, while it occurs in 0.7% of people 60 to 70, 2.3% of those 70 to 80, and nearly 12% of people over 80 years old. [3]

  5. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    Scleral lens, with visible outer edge resting on the sclera of a patient with severe dry eye syndrome. A scleral lens is a large, firm, transparent, oxygen-permeable contact lens that rests on the sclera and creates a tear-filled vault over the cornea. The cause of this unique positioning is usually relevant to a specific patient whose cornea ...

  6. Limbal ring - Wikipedia

    en.wikipedia.org/wiki/Limbal_ring

    A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. [1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. [2] The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral ...

  7. Keratoconus - Wikipedia

    en.wikipedia.org/wiki/Keratoconus

    Scleral lens. Scleral lenses are sometimes prescribed for cases of advanced or very irregular keratoconus; these lenses cover a greater proportion of the surface of the eye and hence can offer improved stability. [56] Easier handling can find favor with people with reduced dexterity, such as the elderly.

  8. Pellucid marginal degeneration - Wikipedia

    en.wikipedia.org/wiki/Pellucid_marginal_degeneration

    People wearing contacts don't report increased problems with glare and contrast sensitivity, but it is not clear if this is due to the corneal disease, or the contact lenses themselves. [citation needed] New studies found that the use of Scleral contact lens, a type of rigid gas permeable (RGP) lens, may be a good option for most people with ...

  9. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Eye color outside of the iris may also be symptomatic of disease. Yellowing of the sclera (the "whites of the eyes") is associated with jaundice, [82] and may be symptomatic of liver diseases such as cirrhosis or hepatitis. [83] A blue coloration of the sclera may also be symptomatic of disease. [82]

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