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.
In early 1896, X-rays were being utilized clinically in the United States for such things as bone fractures and gun shot wounds. Take a look at these early x-rays.----- Review: X-rays were discovered by William Roentgen while experimenting with a cathode radiation .