Characterization and Measurement of the Edge Roughness and Curvature of Intraocular Lenses

摘要

A nondescriptive method of conducting real-time evaluation of edge roughness and curvature of intraocular lenses is described. The technique requires that a collimated beam of light from a low-power helium-neon laser is focused on the lens edge. The direction of the reflected beam provides a measure of the slope of the edge surface. By moving the lens through the beam, its slope at a number of closely-spaced points can be found. With this, a cross-sectional profile of the edge can be numerically generated. Data are collected by orienting the lens so that the reflected laser beam sweeps out a circle on a viewing screen. A conventional television camera then takes an image of the screen and the video output is electronically processed to yield a profile.