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.
With help from Mark Twain, Tesla nearly discovered X-rays. Twain and Tesla became friends in the 1890s, thanks in part to Twainâs lifelong fascination with technology and new inventions. Visiting Teslaâs lab late one night, Twain posed for one of the first photographs to be lit by incandescent light.