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It results in decreased vision in an eye that typically appears normal in other aspects. [1] Amblyopia is the most common cause of decreased vision in a single eye among children and younger adults. [1] The cause of amblyopia can be any condition that interferes with focusing during early childhood.
Computer vision syndrome (CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye's muscles being unable to recover from the constant tension required to maintain focus on a close object.
Macular degeneration is the third main cause of blindness worldwide, and is the main cause of blindness in industrialised countries. [12] Eye infection, inflammation, or injury. Sjögren's syndrome, a chronic autoimmune inflammatory disease that destroys moisture producing glands, including lacrimal gland and leads to dry eye and visual blur. [13]
Floaters and spots are most commonly related to ageing. They are generally harmless and do not cause blindness [7] Eye flashing: characterised by bursts or streaks of light that appear in an individual's field of vision. As eye flashing may indicate impending retinal detachment, medical attention is required. [8]
Anisometropia causes some people to have mild vision problems, or occasionally more serious symptoms like alternating vision or frequent squinting. However, since most people do not show any clear symptoms, the condition usually is found during a routine eye exam. [8] For early detection in preverbal children, photoscreening can be used.
A 2012 review could not find strong evidence for any single cause, although many theories have been discredited. [35] Twin studies indicate that at least some genetic factors are involved. [ 27 ] [ 36 ] [ 37 ] Myopia has been increasing rapidly throughout the developed world, suggesting environmental factors are involved.
Glaucoma, a disease of the eye. [2] Retinitis pigmentosa, a disease of the eye. [3] Blood loss (hypovolemia) Alcohol consumption. [4] In addition, the vision becomes blurred or double since eye muscles lose their precision causing them to be unable to focus on the same object. Sustained (1 second or more) high accelerations. [5]
Aphakia is the absence of the lens of the eye, due to surgical removal, such as in cataract surgery, a perforating wound or ulcer, or congenital anomaly. It causes a loss of ability to maintain focus (accommodation), high degree of farsightedness (), [1] and a deep anterior chamber.
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