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An Image Processing Approach to Pre-compensation for Higher-Order Aberrations in the Eye

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"An Image Processing Approach to Pre-compensation for Higher-Order Aberrations in the Eye", (2003)
Miguel Alonso Jr. and Armando Barreto

ABSTRACT: Human beings rely heavily on vision for almost all of the tasks that are required in daily life. Because of this dependence on vision, humans with visual limitations, caused by genetic inheritance, disease, or age, will have difficulty in completing many of the tasks required from them. Some individuals with severe visual impairments, known as high-order aberrations, may have difficulty in interacting with computers, even when using traditional means of visual correction (e.g., spectacles, contact lenses). This is, in part, because these correction mechanisms can only compensate for the most regular (low-order) distortions or aberrations of the image in the eye. This paper proposes an image processing approach that will pre-compensate the images displayed on the computer screen, so as to counter the effect of the eye's aberrations on the image. The characterization of the eye required to perform this customized pre-compensation is the eye's Point Spread Function (PSF), which can now be measured by a new generation of ophthalmic instruments generically called "Wavefront Analyzers." The characterization provided by these instruments also includes the "higher-order aberration components" and could, therefore, lead to a more comprehensive vision correction than traditional mechanisms. The methods presented here will be explained in terms of their theoretical foundation and illustrated with results from the correction of aberrations introduced by a lens with known and constant PSF.