Fact 1. How many colors and shades our eyes can see It is known that the human eye is able to distinguish only three areas of the spectrum of sunlight - red, blue and green. Moreover, we know seven primary colors of the rainbow. The gray color, it would seem, is not for them applies. However, it is known that our eyes are able to distinguish 500 (!) shades of gray. And in total, an ordinary person is able to distinguish several thousand shades of various colors, and the artist's eyes are several million. Just try to count all the shades of green in your summer garden. At the same time, residents of the Far North, can distinguish hundreds of shades of white – colors snow. All this is possible thanks to a tiny portion of our retina - macula and fovea cells . 2 fact. Does eye size change over the years? From birth, our eyes remain the same size. We grow, our limbs, our nose and ears, and our eyes always remain the same - 2.5 centimeters in diameter and 8 grams in weight. Moreover, only 1/6 of the eye is visible. And only on this visible part relatively safe medical exposure. Even doctors at their international congresses admit that the negative impacts identified so far are widespread a common operation - laser lens replacement. Partly for this reason, many countries began to move away from correction vision with an excimer laser. And for extreme people professions in a number of countries have developed a questionnaire, which includes a question on laser vision correction. 3 fact. How many objects do we see per second? The eyes transmit a huge amount of information to the brain every hour. The eye bandwidth is comparable to that of a large city's ISP. In this case, the images that are sent to our brain arrive in inverted, and the perception of them in their normal form requires us additional mental effort. Considering that open eyes focus on about 50 objects of the outside world per second, and for life we see about 24 million different images, it is not difficult to understand why the eyes load the brain with work much more than all other organs of our body.
