Proceedings PaperThe Design And Performance Of Aspheric Ophthalmic Lenses.
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The significant aberrations in ophthalmic lenses are (oblique) astigmatism (spectacle lenses) and spherical aberration (contact and intra-ocular lenses). In many cases, they cannot be eliminated or sufficiently controlled by bending. Fortunately, aspherizing one or both surfaces allows much greater control over either of these aberrations and in the case of contact and intra-ocular lenses, allows the balancing of the spherical aberration in the eye itself.