Vision 20

The length (shorter or longer) eyeball, certainchanges in the shape of the cornea or aging or of the lens can cause refractiveerrors. Sometimes people have several of these diseases. What is refraction?Refraction occurs when light changes its direction as it passes through oneobject to another. Vision occurs when light rays are deflected (refracted) asthey pass through the cornea and lens, this light is focused on the retina. Andthis transforms light into electrical impulses that are sent to the brainthrough the optic nerve. After all this process, the brain will be in charge ofconverting everything into the images we see. https://www.vision20.info/