The pain disappears if one closes the eye for a few seconds. The most important structures of the eye Eye doctors and many schools have a three dimensional model of the eye. In the model you can see the different parts of the eye better than in a picture. You can ask the doctor to show you which part of the eye he means. The clear piece of cornea is taken from a cadaver eye.
Eye banks collect eyes for corneal transplantation.
Persons who want to donate their eyes carry a special card. When such a person dies the eyes are removed and sent to the eye bank. The central part of the cloudy cornea is removed with a small circular trephane. Sometimes the clear graft becomes cloudy if the patient's body does not accept it. The doctors call this graft rejection .