The Diffractive Multifocal Intraocular Lens

The optical properties of a diffractive multifocal intraocular lens are discussed. The lens possesses two powers, and utilizes the `simultaneous vision' principle where two images are formed at different axial locations. Distant objects are correctly imaged by one power, and near objects are imaged by the other. In each case, one image is in focus at the retina, and the second image is highly defocused with very little structure. The object distance determines which power is used. The lens is designed to provide bifocal operation that is independent of pupil diameter and lens decentration through natural diffraction and interference phenomena.

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