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Topographical disorientation is the inability to orient oneself in one's surroundings, sometimes as a result of focal brain damage. [1] This disability may result from the inability to make use of selective spatial information (e.g., environmental landmarks) or to orient by means of specific cognitive strategies such as the ability to form a mental representation of the environment, also known ...
Dysmetropsia in one eye, a case of aniseikonia, can present with symptoms such as headaches, asthenopia, reading difficulties, depth perception problems, or double vision. [3] The visual distortion can cause uncorrelated images to stimulate corresponding retinal regions simultaneously impairing fusion of the images.
Subsequent investigation pointed to spatial disorientation as a probable cause of the accident. [19] Because of pilot John F. Kennedy Jr.'s fame, the cause of the crash led to extensive reporting of spatial disorientation in the press in 1999. [14] Jan 10, 2000: Niederhasli, Switzerland: Crossair Flight 498: Aug 23, 2000
If present during a large part of childhood, it may result in amblyopia, or lazy eyes, and loss of depth perception. [3] If onset is during adulthood, it is more likely to result in double vision. [3] Strabismus can occur due to muscle dysfunction (e.g., myasthenia gravis [4] [5]), farsightedness, problems in the brain, trauma, or infections. [3]
Derealization is an alteration in the perception of the external world, causing those with the condition to perceive it as unreal, distant, distorted or in other words falsified. Other symptoms include feeling as if one's environment is lacking in spontaneity, emotional coloring, and depth. [ 1 ]
When one eye turns inward, outward, upward, or downward, two different pictures are sent to the brain. Thus, the brain can no longer fuse the two images coming from the two eyes. This causes loss of depth perception and binocular vision. The term is from Greek exo meaning "outward" and trope meaning "a turning". [1]
If there is a unilateral lesion to area V4, a loss of color perception in only half of the visual field may result known as hemiachromatopsia. [3] Similar, but distinct, is color agnosia, which involves having difficulty recognizing colors, while still being able to perceive them as measured by a color matching or categorizing task. [12]
Micropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous ...