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
CT scan and MRI introduced. 1972 - 1985. The use of x-rays in medicine was a huge breakthrough at the turn of the century. The problem with x-rays, though, is that they're two-dimensional. Organs of the same density look the same. But British engineer Godfrey Hounsfield came up with an improvement on the 70-year-old technology. It combined x-ray images with a computer. If you took many x-rays of the same area, at slightly different angles, a computer could put the information from the x-rays together to create a cross-sectional image.