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