This invention relates generally to myopia and myopic progression, and more particularly to imaging systems and non-invasive methods for identification and characterization (quantifiable measurement of the amount, type and orientation) of ocular distortion in the human eye, in order to detect the onset or progression of myopia and facilitate control of myopic progression. The methods extend to measuring [characterizing] retinal shape, including the radius and conic shape.
Background: Visual acuity is the measure of the eye to perfectly resolve images from the real world onto the retina of the eye, and is dependent upon the focusing power of the cornea, the crystalline lens, and the length of the eye. The predominantly studied and often corrected ocular aberrations are power error or defocus, astigmatism, coma and spherical aberration. By contrast, there has been relatively little work done to investigate the effects of distortion, a geometrical aberration, on the human visual experience, or to investigate the related biological mechanisms. Distortion is typically ignored because traditional wavefront sensors measure aberrations at a single field point for each measurement. To measure distortion, many field points would need to be measured simultaneously.
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