An eye blister is a benign growth which can appear on the whites of the eyes or on the cornea itself. There are two main types of eye blister: pinguecula and pterygium.
Before x ray machines were invented, broken bones, tumors and the location of bullets were all diagnosed by physical examination and a doctor's best guess. Patients paid the price of these approaches. Then on November 8th of 1895, a German physics professor Wilhelm Conrad Roentgen made a remarkable discovery.
By January 1896 the world was gripped by X-ray mania, and Roentgen was proclaimed the discoverer of a medical miracle. Within a year, X-rays were being used in diagnosis and therapy and were an established part of medicine. Roentgen did not seek patents on his discovery of X rays, but was the recipient of the first Nobel Prize in physics in 1901. Today we take X-Rays and more sophisticated imaging systems all for granted.