With free-form lenses (also called digital high-definition lenses), the fabrication of the lenses from wearer's eyeglass prescription is optimized with computer-controlled surfacing equipment that is much more precise than conventional tools.
Medical Imaging began with radiography after the discovery of x-rays in 1895 by Wilhelm Roentgen, rÃ¶ntgen A german professor of. physics
A fluoroscopic x-ray system from 1907, the doctor watches the fluorescent screen to see moving x-ray images of the patient's chest and abdomen. The principals of fluoroscopy are much the same as with film x-ray (called radiography) described above. However, fluoroscopic imaging yields a moving x-ray picture or movie. The original fluoroscopes consisted of an x-ray system and a fluorescent screen which registered the x-rays and emitted glowing light.