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A limbal ring is a dark ring around the iris of the eye, where the sclera meets the
The limbal ring is thought to contain corneal epithelium stem cells. Diseases involving a limbal stem cell deficiency are associated with blindness, as those with such deficiencies are "unable to maintain a stable corneal surface." Transplantation of limbal stem cells is a promising therapy for limbal stem cell deficiency.
A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. Along with the anterior chamber and lens, the cornea refracts light, accounting for approximately two-thirds of the eye's total optical ...
.Johnson and Johnson Vision Care Inc. Tinted contact lenses with combined limbal ring and iris patterns. US7246903B2. United States Patent and Trademark Office, July 24, 2007. http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&d=PALL&s1=7246903.PN. It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral cornea. It has been suggested that limbal ring thickness may correlate with health or youthfulness and may contribute to facial attractiveness. Some contact lens
Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, and they can be worn to correct vision or for cosmetic ...
es are colored to simulate limbal rings.
Youth, health, and attractiveness
Both health and age are positively correlated with a prominent limbal ring. For instance, a darker limbal ring tends to be found more attractive than the absence of a limbal ring, suggesting that both sexes "use the limbal ring as a probabilistic indicator of reproductive fitness". Furthermore, limbal rings appear to be most noticeable "for individuals relatively free from chronic health issues".
The limbal ring is thought to contain corneal epithelium stem cells. Diseases involving a limbal stem cell deficiency are associated with blindness, as those with such deficiencies are "unable to maintain a stable corneal surface." Transplantation of limbal stem cells is a promising therapy for limbal stem cell deficiency.
See also
* Circle contact lens * Limbus sign * Corneal limbusReferences
External links
Eye color {{eye-stub