Side lighting

Side light (synonym focal lighting is one of the main methods of clinical research anterior segment of the eye. Is carried out in a dark room. A table lamp is put to the side of the patient and several ahead of him, so that his eyes were brightly lit. The doctor takes in his right hand a strong collective lens (13-20 D) and keeps her so that the focus is collected lens rays were just on the studied part of the eye; under these conditions, the changes become better visible. It is particularly convenient to make a study using two lenses, one of which is the proper lighting, and through the other (left hand) doctor observes region of light eyes enlarged. Instead of the second lens is better to use the achromatic a magnifying glass, giving an increase of 6 and 10 times.