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Amaurosis fugax. The arteries of the choroid and iris. The greater part of the sclera has been removed. Amaurosis fugax (Greek: ἀμαύρωσις, amaurosis meaning 'darkening', 'dark', or 'obscure', Latin: fugax meaning 'fleeting') is a painless temporary loss of vision in one or both eyes. [3]
It most commonly occurs in people over the age of fifty and in the United States is the most common cause of vision loss in this age group. [ 1 ] [ 3 ] About 0.4% of people between 50 and 60 have the disease, while it occurs in 0.7% of people 60 to 70, 2.3% of those 70 to 80, and nearly 12% of people over 80 years old.
Functional visual loss (FVL) also known as Functional vision loss or Nonorganic visual loss (NOVL) is a reduction in visual acuity or loss of visual field that has no physiological or organic basis. This disease can come under the spectrum of functional neurological disorder or somatic symptom disorder .
[50] [51] Blindness in combination with hearing loss is known as deafblindness. It has been estimated that over half of completely blind people have non-24-hour sleep–wake disorder , a condition in which a person's circadian rhythm , normally slightly longer than 24 hours, is not entrained (synchronized) to the light–dark cycle.
Temporary blindness. Temporary blindness, a type of non-permanent vision loss, may refer to: Amaurosis fugax, or fleeting blindness. Conversion disorder, formerly called hysterical blindness. Flash blindness, caused by exposure to high-intensity light.
A clue to the cause of intoxication is the presence of oxalate crystals in the urine. Like methanol intoxication, treatment is ethanol consumption. Ethambutol, a drug commonly used to treat tuberculosis, is notorious for causing toxic optic neuropathy. People with vision loss from ethambutol toxicity lose vision in both eyes equally.
Amblyopia, also called lazy eye, is a disorder of sight in which the brain fails to fully process input from one eye and over time favors the other eye. [1] 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 ...
Posterior ischemic optic neuropathy (PION) is a medical condition characterized by damage to the retrobulbar portion of the optic nerve due to inadequate blood flow (ischemia) to the optic nerve. Despite the term posterior, this form of damage to the eye's optic nerve due to poor blood flow also includes cases where the cause of inadequate ...