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.
X-rays Wilhelm Conrad RÃ¶ntgen, Professor of Physics in Wurzburg, Bavaria, accidentally discovered X-rays in November 1895 while studying cathode rays in a low pressure gas discharge tube. Alone in his laboratory on a Friday evening, he placed his hand in the path of the invisible rays which he was investigating, and saw an image of the bones on the screen beyond.