Standards and technology.

Improvements in standards and technology go hand in hand. A careful study of standards as related to the state of the art always brings to light the need for improving technology. The study involved in revising the 1972 ANSI Z80.1 Standard for Ophthalmic Lenses has focused attention on several new and upcoming developments. These relate (1) to the predetermination of the edger setting, and the use of the perimeter of a lens, (2) the accurate control of centers, (3) the measurement of power and axis, and unwanted power in the periphery, (4) the use of computers in generating the shape of a lens and the location of the MRP, and (5) the standardization of shapes.