RIVER BLINDNESS

River Blindness



River Blindness

The eye and a camera have a lot in common. They both have compound lenses. The cornea and the lens are in charge of focusing light as it enters the eye. The lens is adjustable to allow viewing of both close and distant objects. The iris, just like the iris in a camera, controls the amount of light that enters the eye. It opens and closes to protect the sensitive retina from to much light. The retina covers the back of the eye. It contains millions of photo-receptor cells. These cells react to the presence and intensity ...