This means that in a single day, your eyelids move more than 11,000 times! Blinking helps lubricate and protect the surface of the eye.
The retina projects the images we see in a reversed orientation. The brain, however, instantly processes and corrects them in a fraction of a second.
When we feel excitement, interest, or attraction, the pupils expand. It's the body's way of increasing light intake and focusing better on what captures our attention.
Vision is by far the most "dominant" sense. The brain invests a lot of energy processing colors, shapes, motion and depth — which is why screens can tire us so easily.
Rods and cones work together to let us see in the dark, in daylight, and to distinguish colors and fine details. Even with modern technology, no camera sensor comes close to this complexity.
During sleep, the tear glands and tear film remove dust, particles and microbes — which is why the "sleep" in the corner of your eyes in the morning is completely normal.
At the point where the optic nerve leaves the retina, there are no photoreceptors. We don't notice it, because the brain "fills in" the missing information based on the environment.
During the first months, babies mainly perceive high-contrast patterns (black–white). Full color vision develops gradually up to around the 6th month.
Although we don't all have the same color sensitivity, the average person sees an astonishing range of shades. Some women are "tetrachromats" and can perceive even more!
A single blink lasts about 0.3 seconds, but the brain "fills in" the gap so we don't perceive any interruption in our vision.