We sense visual information with our eyes. The eyes are mostly protected by the skull, leaving only a small part of them visible. The visible parts of the eye include the translucent cornea, the colorful iris and the dark, central part of the eye's lens known as the pupil. The lens reflects light and can be controlled by the eye's muscles. This makes it possible for us to focus on objects at different distances.

The visual information is reflected into the eye's retinas. From there, the visual information travels to the brain via the visual nerve. The function of the iris is to regulate the amount of light that is absorbed by the eye. 




The function of the eye's lens can be improved with eyeglasses. For example, many people over 50 experience difficulties in looking at things that are close to them. This is caused by the fact that the lens' ability to reflect light decreases as a peson ages. This can be fixed with eyeglasses that help the lens to reflect life more efficiently.

The eyes are sensitive organs that should be protected. Small particles of dust, chemicals and solar radiation are all harmful to your eyes. This is why the eyes should be protected with sunglasses when spending a lot of time outdoors during the summer. Similarly, staring at a computer screen for long periods of time will tire your eyes out.