The light-sensitive layer of retinal cells converts light into electrical signals which are then sent to the brain where they are turned into the images we see. A brilliant network of tiny blood vessels constantly supplies blood to the retina.
If you think your eyesight is normal and you are not wearing specs too, chances are, you have hardly visited an ophthalmologist. Most of the eye disorders are detected too late with the underlying conditions having progressed far enough to warrant a consultation with a specialist.