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Xanthopsia is a color vision deficiency in which there is a dominantly yellow bias in vision due to a yellowing of the optical media of the eye. The most common causes are digoxin's inhibitory action on the sodium pump, and the development of cataracts which can cause a yellow filtering effect.
Acute posterior multifocal placoid pigment epitheliopathy primarily occurs in adults (with a mean age of 27). [1] Symptoms include blurred vision in both eyes, but the onset may occur at a different time in each eye. There are yellow-white placoid lesions in the posterior pole at the level of the retinal pigment epithelium. Some suggest a ...
A major cause of Bitot's spots is vitamin A deficiency (VAD). [4] Rarely, pellagra due to deficiency of vitamin B 3 (niacin) may also cause Bitot's spots. [5] They can also be caused by Colestyramine , which is a bile acid sequestrant which can reduce the absorption of fat soluble vitamins (Vitamins A, D, E, K)
Here, experts share ocular migraine symptoms, causes, and treatments. Ocular migraines affect your vision in one or both eyes. Here, experts share ocular migraine symptoms, causes, and treatments. ...
Normal adult hemoglobin A molecule comprises two α and two β globin chains associated with a heme ring. Mutation at the 6th position of the beta chain is the cause of sickle cell disease. [ 10 ] Due to sickle cell disease, vascular occlusion may occur in the conjunctiva, iris, retina, or choroid.
A person with photic retinopathy may notice an impairment in their vision, for example a spot that does not go away after a reasonable recovery time, or blurring. They may also have eye pain or headaches. Vision impairment is usually in both eyes, but can be in just one. Impairment of a person with 20/20 vision usually ends up being about 20/40 ...
It may be caused by vitamin A deficiency, [1] which is sometimes used to describe that condition, although there may be other causes. Xerophthalmia caused by a severe vitamin A deficiency is described by pathologic dryness of the conjunctiva and cornea. The conjunctiva becomes dry, thick and wrinkled. The first symptom is poor vision at night.
(H54) Blindness — the brain does not receive optical information, through various causes (H54/B73) River blindness — blindness caused by long-term infection by a parasitic worm (rare in western societies) (H54.9) Micropthalmia/coloboma — a disconnection between the optic nerve and the brain and/or spinal cord