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Ischemic optic neuropathy (ION) is the loss of structure and function of a portion of the optic nerve due to obstruction of blood flow to the nerve (i.e. ischemia).Ischemic forms of optic neuropathy are typically classified as either anterior ischemic optic neuropathy or posterior ischemic optic neuropathy according to the part of the optic nerve that is affected.
(H16.0) Corneal ulcer / Corneal abrasion — loss of the surface epithelial layer of the eye's cornea (H16.1) Snow blindness / Arc eye — a painful condition caused by exposure of unprotected eyes to bright light (H16.1) Thygeson's superficial punctate keratopathy (H16.4) Corneal neovascularization (H18.5) Fuchs' dystrophy — cloudy morning ...
368.9 Unspecified; 369 Blindness and low vision. 369.0 Blindness, both eyes; 369.1 Blindness, one eye, low vision other eye; 369.2 Low vision, both eyes; 369.3 Unqualified visual loss, both eyes; 369.4 Legal blindness, as defined in U.S.A. 369.6 Blindness, one eye; 369.7 Low vision, one eye; 369.8 Unqualified visual loss, one eye; 369.9 ...
Vision loss in toxic and nutritional optic neuropathy is bilateral, symmetric, painless, gradual, and progressive. Dyschromatopsia, a change in color vision, is often the first symptom. Some patients notice that certain colors, particularly red, are less bright or vivid; others have a general loss of color perception.
Leber's hereditary optic neuropathy (LHON) is the most frequently occurring mitochondrial disease, and this inherited form of acute or subacute vision loss predominantly affects young males. LHON usually presents with rapid vision loss in one eye followed by involvement of the second eye (usually within months).
Cortical blindness is the total or partial loss of vision in a normal-appearing eye caused by damage to the brain's occipital cortex. [1] Cortical blindness can be acquired or congenital, and may also be transient in certain instances. [2]
Generally, exotropia progresses in frequency and duration. As the disorder progresses, the eyes start to turn out when looking at close objects as well as those in the distance. If left untreated, the eye may turn out continually, causing a loss of binocular vision or stereopsis.
Amblyopia: is a category of vision loss or visual impairment that is caused by factors unrelated to refractive errors or coexisting ocular diseases. [59] Amblyopia is the condition when a child's visual systems fail to mature normally because the child either has been born premature, measles, congenital rubella syndrome, vitamin A deficiency ...