The light incident on the eye is refracted on the front surface of the eye, in the cornea, lens and vitreous body (i.e., in the optical system of the eye), due to which a real, reduced, inverted image of the objects under consideration is formed on the retina
Light falling on the ends of the optic nerve, which make up the retina, irritates these ends. Irritations along nerve fibers are transmitted to the brain, and a person receives a visual impression, sees objects. The process of vision is corrected by the brain, so we perceive the subject directly.
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.