Red-eye effect Guide, Meaning , Facts, Information and Description
The effect is generally more pronounced in people with gray or blue eyes and in children (whose eyes have larger pupils and less pigmentation than adults).
In many species the tapetum lucidum, a light-reflecting layer behind the retina that improves night vision, intensifies this effect. This leads to variations in the colour of the reflected light from species to species. Cats, for example, display blue, yellow, or green eyes in flash photographs.
Retinoblastoma is a cancer of the eye that often causes the appearance of a "white eye" effect instead of the expected red eye.
The red eye effect can be prevented by placing the flash away from the camera which is the most preferrable method for reducing the red-eye effect. This way, the flash light cannot enter the eye straightly. The light reflected by the retina will not be captured by the camera's lens, thus the eyes will appear naturally. Another method is taking pictures with no flash (either by increasing the ambient lighting, or by digitally post-processing the picture to increase its brightness). Many modern cameras precede the flash by a period of bright light, allowing the iris to close (the "anti red eye system"). Professional photographers prefer the former approaches, as the anti red eye system does not always prevent red eyes (for example if people look away during the pre-flash), and in any case people with small pupils do not look natural on photographs. Various graphics editing software packages have functions to automatically remove red eyes from digital photographs.
If photos or videos are shot with infrared-sensitive equipment, the eyes also usually look unnaturally bright. The reason is the same: the blood-rich retina.
This is an Article on Red-eye effect. Page Contains Information, Facts Details or Explanation Guide About Red-eye effect