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In central heterochromia, there is a ring around the pupil or possibly spikes of different colors radiating from the pupil. Though multiple causes have been posited, the scientific consensus is that a lack of genetic diversity is the primary reason behind heterochromia, at least in domestic animals.
It has been suggested that limbal ring thickness may correlate with health or youthfulness and may contribute to facial attractiveness. [3] [4] The thickness of the limbal ring varies by pupil dilation: When the pupil is larger, the limbal ring narrows. [5] Some contact lenses are colored to simulate limbal rings. [1]
Arcus senilis (AS), also known as gerontoxon, arcus lipoides, arcus corneae, corneal arcus, arcus adiposus, or arcus cornealis, are rings in the peripheral cornea.It is usually caused by cholesterol deposits, so it may be a sign of high cholesterol.
Kayser–Fleischer rings (KF rings) are dark rings that appear to encircle the cornea of the eye. They are due to copper deposition in the Descemet's membrane as a result of particular liver diseases. [1] They are named after German ophthalmologists Bernhard Kayser and Bruno Fleischer who first described them in 1902 and 1903.
The corneal limbus manifests as a dark ring around the iris. Its prominence varies by individual. The corneal limbus is the border between the cornea and the sclera. [1] It is highly vascularised. [1] Its stratified squamous epithelium is continuous with the epithelium covering the cornea. [2]
Gomez, who wore the gold ring as she left a Subway in Los Angeles, went casual for her afternoon sandwich outing in black leggings, an oversized slate gray graphic Selena T-shirt, and a pair of ...
In western states, a paint ring may signify a tree affected by mountain pine beetles. A splotch of head-high color could also be a trail marker, showing hikers or mountain bikers which way to go.
Eye color is an inherited trait determined by multiple genes. [14] [15] These genes are sought by studying small changes in the genes themselves and in neighboring genes, called single-nucleotide polymorphisms or SNPs.