Patent ID: 8659757

Claim:
A method for visually testing the chromatic aberration in an optical device, where the method utilizes a testing apparatus that has a representation of at least two or more colors denoted by their wavelength, such that each color utilized is separated by no less than 75 nanometers in wavelength, and where each color is set beside another in close proximity, in a pattern, shape, or letter, or any combination thereof, and further wherein a tester is positioned at a distance away from the testing apparatus that is the same or greater than the minimum focal distance of the optical device being tested, wherein the method compromises the steps of: viewing the testing apparatus through at least the optical device being tested, and visual observing the resulting image, either directly or indirectly by means of an imaging or projecting device; determining the degree of chromatic aberration of the optical device based upon the number of distinctive objects viewed in a single test iteration, where two or more distinctive objects or features viewed corresponds to an optical device with low chromatic aberration, a partially merged object viewed corresponds to an optical device with medium chromatic aberration, and whereas only a single or merged object or feature viewed corresponds to an optical device with high chromatic aberration; and providing an assessment of the chromatic aberration based upon the determining step.