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Xerophthalmia (from Ancient Greek xērós (ξηρός) meaning "dry" and ophthalmos (οφθαλμός) meaning "eye") is a medical condition in which the eye fails to produce tears. It may be caused by vitamin A deficiency, [ 1 ] which is sometimes used to describe that condition, although there may be other causes.
Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]
The signs and symptoms of far-sightedness include blurry vision, frontal or fronto temporal headaches, eye strain, tiredness of eyes, etc. [2] The common symptom is eye strain. Difficulty seeing with both eyes ( binocular vision ) may occur, as well as difficulty with depth perception. [ 1 ]
Choroideremia (/ k ɒ ˌ r ɔɪ d ɪ ˈ r iː m i ə /; CHM) is a rare, X-linked recessive form of hereditary retinal degeneration that affects roughly 1 in 50,000 males. The disease causes a gradual loss of vision, starting with childhood night blindness, followed by peripheral vision loss and progressing to loss of central vision later in life.
Researchers then analyzed the rate of patients diagnosed with NAION, a rare condition that is the second-leading cause of optic nerve blindness. NAION is believed to be caused by reduced blood ...
Cortical blindness refers to any partial or complete visual deficit that is caused by damage to the visual cortex in the occipital lobe. Unilateral lesions can lead to homonymous hemianopias and scotomas. Bilateral lesions can cause complete cortical blindness and can sometimes be accompanied by a condition called Anton-Babinski syndrome. [26]
NAOIN is a rare eye condition, but it’s the second-leading cause of optic nerve blindness and can lead to permanent vision loss, according to Brigham and Women’s Hospital. The exact cause of ...
Like rheumatism, night blindness was viewed as a condition that could be easily faked or exaggerated, and initially, people with night blindness were regarded with some suspicion. Some soldiers who reported symptoms of nyctalopia also presented with symptoms of scurvy, suggesting a fundamental cause of poor nutrition. [7]
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