Abstract
The effect of media disturbances on the retinal projection of the external light distribution can be described by means of the so-called point spread function (PSF). The PSF is defined as the retinal light distribution resulting from an external point source. Consequently visual field changes because of media disturbances can be understood if the PSF could be measured. These visual field changes may include sensitivity loss because of increased light scattering in lens or cornea. We have designed a new method to learn more about the pathological PSF than was possible up to now. With this method we are able to measure the part of the PSF outside 1 degree, relative to the central portions of the PSF. Using this method complemented with the help of the modulation transfer function, actual pathological PSF’s were estimated. Considerable changes in the visual field were predicted for relatively mildly disturbed media.
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