Patent ID: 6972136

Claim:
A method for making optical lenses having an anti-reflection (AR) coating comprising the steps of: supplying an optical lens; positioning the lens in a vacuum chamber of a vacuum deposition apparatus; providing in the vacuum chamber a source of at least one high index of refraction AR composition and at least one low index of refraction AR composition; applying a layer of the high index material on the lens until the desired optical thickness coating is applied; applying a layer of the low index material on the lens until the desired optical thickness coating is applied; and repeating the application steps until the desired anti-reflection coating is applied; with the proviso that the reflected light off the anti-reflection coating be controlled so that the ratio of blue light to green light to red light provides a substantially white reflected light and the further step of adjusting the optical thicknesses of the AR coating layers to minimize the differences between the tensile stress and compressive stress of the layers.