The human eye has an almost spherical shape, it is protected by a dense shell – the sclera. The front of the sclera is the cornea (cornea), behind it is the iris. There is a watery liquid between the cornea and the iris. In the iris there is a hole – the pupil, behind it there is a transparent body, similar in shape to a biconvex lens – the lens, which is surrounded by muscles. The vitreous body is located behind the lens. The back of the sclera is covered with a retina, which consists of nerve endings.
Thanks to vision with two eyes, we see an object volumetric, not flat.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.