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Multifocal Optics of the Fish Lens for Clear Color Vision

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Abstract

Vision is based on the creation of images on the retina in the rear of the eye. However, creating an image of high information content is far from trivial. Several refractive elements in combination seem to be necessary to correct for various optical aberrations. A standard camera objective, for example, consists of about eight lenses. Biological optical systems appear to be much simpler. The human eye has only two refractive elements; the cornea, constituting a curved interface between the surrounding air and the water-filled interior of the eye, and the crystalline lens inside the eye. The sophistication of the eye’s optical system resides in the complex gradient-index optics of the lens that corrects for the aberrations of the cornea. Furthermore, adjustment of focus is achieved by changes in lens shape and thus refractive power.

© 2011 Optical Society of America

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