Eighty per cent of information is conveyed through the eyes. It is therefore essential for the visual system to be in optimal condition to ensure that nothing hinders the proper intellectual development.

The eyeball is a highly complex optical system connected directly to the brain through the optic nerve.

The eye captures light from the exterior, creates an optical image on the retina and transmits the image along the optic nerve to the brain. The visuopsychic area of the brain sorts information, compares it with the patterns of previous experience and generates the perception of form, light, colour and orientation.