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Monocular vision impairment refers to having no vision in one eye with adequate vision in the other. [2] Monopsia is a medical condition in humans who cannot perceive depth even though their two eyes are medically normal, healthy, and spaced apart in a normal way. Vision that perceives three-dimensional depth requires more than parallax. In ...
Hemianopsia, or hemianopia, is a visual field loss on the left or right side of the vertical midline. It can affect one eye but usually affects both eyes. Homonymous hemianopsia (or homonymous hemianopia) is hemianopic visual field loss on the same side of both eyes. Homonymous hemianopsia occurs because the right half of the brain has visual ...
Leber's hereditary optic neuropathy (LHON) is the most frequently occurring mitochondrial disease, and this inherited form of acute or subacute vision loss predominantly affects young males. LHON usually presents with rapid vision loss in one eye followed by involvement of the second eye (usually within months).
Furthermore, in some cases each eye can contribute to peripheral vision for one side of the field of view (see also monofixation syndrome). However, there is an exception to this: Those with true congenital alternating squints have two healthy eyes, and the ability to switch (by choice) between seeing with either eye.
One eye may perform significantly worse than the other, and depth perception can be very limited (although not necessarily zero). The field of view may be severely limited. [ 3 ] The best vision might be in the centre (like tunnel vision ) but more often it is at some other point, and it is difficult to tell what the person is really looking at.
During some episodes, the visual loss may occur with no headache and at other times throbbing headache on the same side of the head as the visual loss may occur, accompanied by severe light sensitivity and/or nausea. Visual loss tends to affect the entire monocular visual field of one eye, not both eyes. After each episode, normal vision returns.