Intraocular Lenses, Tilt and Astigmatism

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Abstract
Concern was expressed in the literature regarding the frequency and amount of astigmatism found in patients with intraocular lens implants. Postoperative tilting of the implants is one suggested cause. The effect of tilt on focal length was measured in lenses supplied by 2 companies. The method used involved photographing the refractive effect of lenses on fine parallel laser beams as the lenses were tilted to varying degrees. Drastic tilting (e.g., 20.degree.) is required to produce significant amounts of variation in focal length. The effect on back vertex power is more important and spherical aberration of the lenses is minimized.

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