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The lenses may be eyeglasses, contact lenses or handheld lenses, but are divided in this article according to their working principle. Most lenses are intended for red-green color blindness , though some lenses are also marketed for blue-yellow color blindness.
Some colored contact lenses completely cover the iris, thus dramatically changing eye color. Other colored contact lenses merely tint the iris, highlighting its natural color. A new trend in Japan, South Korea and China is the circle contact lens , which extend the appearance of the iris onto the sclera by having a dark tinted area all around.
The Graphic Diameter (G.DIA) of colored contact lenses refers to the diameter of the tinted area on the lens, specifically the colored section that covers the eye. Unlike the total Diameter (DIA) of the contact lens, the Graphic Diameters (G.DIA) only measures the colored portion, and it is typically expressed in millimeters (mm).
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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. The total number of genes that contribute to eye color is unknown, but there are a few likely candidates.
There are three kinds of lenses that an individual can wear that can increase their accuracy in some color related tasks (although none of these will "fix" color blindness or grant the wearer normal color vision): A red-tint contact lens worn over the non-dominant eye will leverage binocular disparity to improve discrimination of some colors ...
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