Search results
Results from the WOW.Com Content Network
Scintillating scotoma is a common visual aura that was first described by 19th-century physician Hubert Airy (1838–1903). Originating from the brain, it may precede a migraine headache, but can also occur acephalgically (without headache), also known as visual migraine or migraine aura. [4]
Tunnel vision; Scotoma. Blind or dark spots; Curtain like effect over one eye; Slowly spreading spots; Kaleidoscope effects; Temporary blindness in one or both eyes; Heightened sensitivity to light; Auditory changes. Hearing voices or sounds that do not exist: auditory hallucinations
Closed-eye hallucinations and closed-eye visualizations ( CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye.
Persistence of vision is the optical illusion that occurs when the visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye. [1] The illusion has also been described as "retinal persistence", [2] "persistence of impressions", [3] simply "persistence" and other variations.
Kaleidoscope. A toy kaleidoscope. A kaleidoscope ( / kəˈlaɪdəskoʊp /) is an optical instrument with two or more reflecting surfaces (or mirrors) tilted to each other at an angle, so that one or more (parts of) objects on one end of these mirrors are shown as a regular symmetrical pattern when viewed from the other end, due to repeated ...
Causes. Retinal migraine is caused by the blood vessels (that leads to the eye) suddenly narrowing (constricting), reducing blood flow to the eye, which causes aura in vision. It may be triggered by: Stress; Smoking; High blood pressure; Oral contraceptive pill; Exercise; Hay fever; Bending over; High altitude; Dehydration; Low blood sugar ...
Neurology, ophthalmology. Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally or vertically in relation to each other. [1] Also called double vision, it is a loss of visual focus under regular conditions, and is often voluntary.
Netflix's Kaleidoscope is a heist story—with a twist.While you've likely seen Ocean's Eleven, Reservoir Dogs, and Baby Driver (and if you haven't seen Widows, the time to check that one out is ...
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.
Lesions in optic nerve causes visual field defects and blindness. Causes. Causes of optic nerve lesions include optic atrophy, optic neuropathy, head injury, traumatic avulsion, acute optic neuritis etc. Signs and symptoms Visual field-tubular vision Visual field-central scotoma