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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]
Rarely, blindness is caused by the intake of certain chemicals. A well-known example is methanol, which is only mildly toxic and minimally intoxicating, and breaks down into the substances formaldehyde and formic acid which in turn can cause blindness, an array of other health complications, and death. [66]
Recovery from blindness is the phenomenon of a blind person gaining the ability to see, usually as a result of medical treatment. As a thought experiment , the phenomenon is usually referred to as Molyneux's problem .
The major causes of CVI are as follows: asphyxia, hypoxia (a lack of sufficient oxygen in the body's blood cells), or ischemia (not enough blood supply to the brain), all of which may occur during the birth process; developmental brain defects; head injury; hydrocephalus (when the cerebrospinal fluid does not circulate properly around the brain ...
NAION is believed to be caused by reduced blood flow to the optic nerve head. It can lead to permanent visual loss in one eye that may develop painlessly and suddenly or over several days before ...
While it does not result in complete blindness, loss of central vision can make it hard to recognize faces, drive, read, or perform other activities of daily life. [1] Visual hallucinations may also occur. [1] Macular degeneration typically occurs in older people, [1] and is caused by damage to the macula of the retina. [1]
To Jake Gyllenhaal, his blindness is an acting advantage. The Road House star, 43, recently spoke to The Hollywood Reporter about how he's used his legal blindness in his acting. Gyllenhaal has ...
Without treatment, people can go blind, and their pupils will dilate and stop reacting to light. Ethylene glycol, a component of automobile antifreeze, is a poison that is toxic to the whole body including the optic nerve. Consumption can be fatal, or recovery can occur with permanent neurologic and ophthalmologic deficits.