Measuring Method of Eyes Diopter Based on Image Measuring Technology

Measuring system of eyes diopter is designed with diopter adjustment theory of visual optics and image measuring technology. Measuring methods of presbyopia, myopia, hyperopia and astigmatism are discussed. A link image is projected to the measured eye ground, and then the reflection image is measured from eye ground by CCD device. Finally, size and shape of the image are automatically recognized by computer. Far point diopter and near point diopter are measured according to the method. Far point diopter is defined as the fitting glasses parameters of hyperopia, myopia and astigmatism. Fitting glasses parameters of presbyopia are related to far point diopter and near point diopter. Calculation methods of fitting glasses parameters are given. Because measuring methods utilize advantages of subjective optometry and objective optometry, fitting glasses parameters may be quickly and accurately measured.