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Human Eye. Cyanopsia is a rare visual phenomenon characterized by a blue tint to vision. Most commonly associated with cataract surgery and certain medications, such as sildenafil, cyanopsia is typically a temporary side effect rather than a standalone disease.
Even people with the lightest blue eyes, with no melanin on the front of the iris at all, have dark brown coloration on the back of it, to prevent light from scattering around inside the eye. In those with milder forms of albinism , the color of the iris is typically blue but can vary from blue to brown.
By Susana Victoria Perez, Buzz60 If you think you have blue eyes, think again, they are actually tricking you! All eyes are really brown. According to CNN, Dr. Gary Heiting, a licensed optometrist ...
Large lenses can gather and concentrate light, thus intensifying light with purely optical means and enabling the user to see better in the dark than with the naked eye alone. Often night glasses also have a fairly large exit pupil of 7 mm or more to let all gathered light into the user's eye.
These are simultaneously dark and impossibly saturated. For example, to see "stygian blue": staring at bright yellow causes a dark blue afterimage, then on looking at black, the blue is seen as blue against the black, also as dark as the black. The color is not possible to achieve through normal vision, because the lack of incident light (in ...
Blue eyes are also found in parts of Western Asia, most notably in Afghanistan, Syria, Iraq, and Iran. [53] In Estonia, 99% of people have blue eyes. [54] [55] In Denmark in 1978, only 8% of the population had brown eyes, though through immigration, today that number is about 11%. [55] In Germany, about 75% have blue eyes. [55]