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A limbal ring is a dark ring around the iris of the eye, where the
Both health and youth 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.
A limbal ring is a dark ring around the iris of the eye, where the sclera
The sclera, also known as the white of the eye or, in older literature, as the tunica albuginea oculi, is the opaque, fibrous, protective outer layer of the eye containing mainly collagen and some crucial elastic fiber.
In the development of t ...
meets the cornea
The cornea is the transparency (optics), transparent front part of the eyeball which covers the Iris (anatomy), iris, pupil, and Anterior chamber of eyeball, anterior chamber. Along with the anterior chamber and Lens (anatomy), lens, the cornea ...
. 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. The thickness of the limbal ring varies by pupil dilation: When the pupil is larger, the limbal ring narrows. 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 youth 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
A circle contact lens, also known as a big eye contact lens and circle lens, is a :wikt:cosmetic, cosmetic (non-corrective and decorative) contact lens that makes the eye's iris (anatomy), iris appear larger. It has become a trend throughout East ...
* Corneal limbus
* Limbus sign
The limbus sign is a ring of dystrophic calcification evident as a "milky precipitate" (i.e. abnormal white color) at the corneal limbus. The corneal limbus is the part of the eye where the cornea (front/center) meets the sclera (white part of th ...
References
External links
* Eye color {{Eye-stub