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The condition primarily affects the retina, the light-sensitive layer at the back of the eye, and sometimes the optic nerve, which transmits visual signals to the brain. Following cataract surgery, the replacement of the natural lens with a synthetic one increases sensitivity to blue light, resulting in a blue-tinged visual field. Similarly ...
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]
The blue tint is caused by the showing of the underlying uveal tract (choroid and retinal pigment epithelium). In those with Ehlers-Danlos syndrome, the sclera may be tinted blue due to the lack of proper connective tissue. [16] In very rare but severe cases of kidney failure and liver failure, the sclera may turn black. [citation needed]
Histopathological staining shows characteristic alcian blue-positive deposits. [7] Various imaging modalities, including confocal microscopy and ocular coherence tomography , can provide information about the changes within the cornea and may be suitable replacements for tissue biopsy and excision.
Similarly, blue and violet hues are perceived when the S receptor is stimulated more. S Cones are most sensitive to light at wavelengths around 420 nm. At moderate to bright light levels where the cones function, the eye is more sensitive to yellowish-green light than other colors because this stimulates the two most common (M and L) of the ...
Blue-sensitive opsin is a protein that in humans is encoded by the OPN1SW gene. [ 5 ] [ 6 ] [ 7 ] The OPN1SW gene provides instructions for making a protein that is essential for normal color vision. This protein is found in the retina, which is the light-sensitive tissue at the back of the eye.
Iron-deficiency anemia may give symptoms that can include spoon-shaped nails, restless legs syndrome, and pica (the medical condition indicates the desire for things that are not food, such as ice, dirt, etc.). [29] A blue coloration of the sclera may be noticed in some cases of iron-deficiency anemia. [30]
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 ...