Abstract
Apart from monofocal intraocular lenses (IOL) increasing numbers of bifocal IOLs are implanted. Besides the basic refractive power necessary for far vision these lenses have an additional refractive power which allows near vision. Since two images are superimposed upon each other, the contrast of the retinal image is reduced. If the correct lens is implanted the patient needs no glasses, otherwise he will need only monofocal glasses.
© 1993 Optical Society of America
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