What causes red-eye in photos? Detailed answer

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What causes red-eye in photos? Detailed answer

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What causes red-eye in photos?

The flash, located on the same optical axis as the camera, is to blame for the appearance of red eyes in photographs. Its bright light passes through the pupil and is reflected from the choroid that feeds the retina with blood - this is the reason for the red color. The effect is more pronounced in fair-skinned people, as they have a lower concentration of melanin pigment, as well as in children, because their pupils dilate faster in the dark. Keeping the flash away from the lens helps to avoid red-eye.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What is gum?

Gum (the resinous secretion of plants), or gum, can be used for a variety of purposes, more important than just providing you with chewing gum. And, of course, there are a great many types of gum. One of these species, the so-called "gum arabic" (gum arabic), is used for the manufacture of candy, medicines and glue, as well as in the manufacture of silk.

Like most natural resins, gum is obtained from plants as a thick, sticky liquid that hardens in air and dissolves in water. Gum arabic is isolated by some types of acacias growing in Africa, Australia and Asia. It is sold in the form of transparent yellow or reddish pieces.

Some types of gum do not dissolve in water, but absorb it, forming a soft, sticky, gelatinous mass. Such gum is called "dragon gum" (dragon gum), which is used for the production of cough tablets and for fabric processing. Another important type of gum is cherry gum, which is used to starch straw in the manufacture of straw hats and other items.

Other types of gum are plum, peach, spruce, rubber. Rubber is obtained from gum trees and is used to make chewing gum. All these types of gums are used to produce inks, textiles, paper, medicines. Some of the highest quality varieties are used in medical and scientific laboratories for culture work. Most often, the gum is harvested during the dry season and brought to the market in the form of "noodles" or "tears".

Chemically, gum is made up of acid molecules linked to sugar molecules. In addition to pure gum, which we talked about, there is also stone resin. It is also obtained from plants, but differs from pure gum in that it does not completely dissolve in water. The two best-known types of this resin are frankincense and myrrh. These are highly fragrant substances and are used to produce perfumes and essences.

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