Aberrations are errors in an image that occur because of imperfections in the optical system. There are many different kinds of aberrations but here we will look at only two that are present in the eye.
code Spherical aberration with a general, spherical lens. Rays leaving the same point are focused at different locations, depending on their distance from the optical axis.
code This is an exaggeration of chromatic aberration for a general, spherical lens. Rays coming in parallel to the lens are focused at different locations, depending on their wavelengths.
These problems are often compensated for by neurological processing and present themselves only in certain situations, such as night work, where the pupil is dialated and outer parts of the eye contribute to spherical aberration.
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