Visual pathology rectification

Human beings mostly rely on vision for most of the daily activities; any deformity in vision can limit a person's actions. These visual impairments can be genetic or age-related. Many individuals with a low and high-order visual problem find it hard to use a computer, even with the use of corrective lens, which can lower the self-esteem of an individual, as the use of computers have increased over the years. In this project, an algorithm was designed using a user's wave aberration in the eye, this aberration is used to generated the Point Spread Function (PSF) of the eye. The PSF describes the degree of spreading of an image at the focal point, hence it is a measure for the quality of an optical system. This PSF can be used as an impulse response to blur an image, and the image is recovered back using the same PSF by a deconvolution procedure. This processed image is presented to the user. Another possible method is the use of geometric optics. Optics describe the properties of a ray of light as it propagates through an optical system. These properties are described in a transfer matrix, which is then used to improve an image for a visual impaired user. Results show that while viewing the screen, using Fourier optics method of compensation, alters the image that can be seen by a visual impaired person. On the other hand the results obtained from the geometrical optics do not modify the image as per the user requirements.

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