Influence of the corneal optical zone on the point-spread function of the human eye

Pascal O. Rol; Jean-Marie A. Parel

doi:10.1117/12.137442

14 August 1992 Influence of the corneal optical zone on the point-spread function of the human eye

Pascal O. Rol, Jean-Marie A. Parel

Proceedings Volume 1644, Ophthalmic Technologies II; (1992) https://doi.org/10.1117/12.137442
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

In refractive surgery, a number of surgical techniques have been developed to correct ametropia (refractive defaults) of the eye by changing the exterior shape of the cornea. Because the air-cornea interface makes up for about two thirds of the refractive power of the eye, a refractive correction can be obtained by a suitable reshaping of the cornea. Postoperatively, it is usually observed that the corneal region consists of two or more zones which are characterized by different optical parameters exhibiting in particular different focal distances. Under normal circumstances, only the central area of the cornea is involved in the formation of the retinal image. However, if part of the light entering the eye through peripheral portions of the cornea with refractive properties different from the central area can pass the pupil, an out-of-focus `ghost' image may be overlaid on the retina causing a blur. In such a case the resolution, and the contrast performance of the eye which is expected from a successful operation, may be reduced. This study is an attempt to quantify the vision blur as a function of the diameter of the central zone, i.e., the optical zone which is of importance for vision.

Citation Download Citation

Pascal O. Rol and Jean-Marie A. Parel "Influence of the corneal optical zone on the point-spread function of the human eye", Proc. SPIE 1644, Ophthalmic Technologies II, (14 August 1992); https://doi.org/10.1117/12.137442

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