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Entoptic phenomena (from Ancient Greek ἐντός (entós) 'within', and ὀπτικός (optikós) 'visual') are visual effects whose source is within the human eye itself. (Occasionally, these are called entopic phenomena, which is probably a typographical mistake.) In Helmholtz 's words: "Under suitable conditions light falling on the eye ...
Flash blindness is caused by bleaching (oversaturation) of the retinal pigment. [2] As the pigment returns to normal, so too does sight. In daylight the eye's pupil constricts, thus reducing the amount of light entering after a flash.
As far as regards subjects with normal binocular vision, the widespread notion that the individual's better-sighted eye would tend to be the dominant eye has been challenged as lacking empirical basis. Dominance can change and may switch between the eyes depending on the task and physical condition of the subject (i.e. fatigue). [citation needed]
Cyanopsia is a medical term for seeing everything tinted with blue. It is also referred to as blue vision. Cyanopsia often occurs for a few days, weeks, or months after removal of a cataract from the eye. Cyanopsia also sometimes occurs as a side effect of taking sildenafil, tadalafil, or vardenafil. [1]
The son of a woman killed by a driver with sight issues wants medics to inform when people are unfit to drive.
It was a sign of a rare cancer. Meghan Holohan. Updated May 7, 2024 at 5:53 AM. Last March, Jennifer Cunningham noticed her husband, Chris Cunningham, had a swollen eye. “My eye was smaller than ...
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