"Blind spot"

not the whole area of ​​the retina of the human eye is sensitive to light. We just think that we can see everything that comes into view, but in fact in our eyes is the "blind spot." In this zone there is a special name - "blind spot." The presence of blind spots (they exist in both eyes, but with different people - in different places) is due to the structure of the eye. Nerve fibers from the receptors to the blind spots are on top of the retina and the optic nerve going to that passes through the retina on the other side of it, and because at this point there are no light retseptory.

So, we suggest you look in the eyes of the blind spot! This is done like this: close your right eye and left eye see the right cross that circled column circle. Keep your face and the monitor horizontally. Without taking his eyes from the right cross, zoom (in or out) face on the monitor at the same time watch out for a left cross (not translated at him). At some point, it will disappear .: wikipedia.org

Source: mirfactov.com/