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
History. The earliest report on contrast agents in ultrasound imaging dates back to 1968. The first investigations used air-filled microbubbles, which were highly unstable, dissolved rapidly in blood and lost their echogenicity; furthermore, significant amounts were filtered by the lungs because of their large diameter.