Abstract

It has been generally considered that on the visual axis in monochromatic light, the eye is limited only by diffraction effects for pupil diameters up to 2mm¹ and thereafter is predominantly affected by spherical aberration. Most eyes are considered to suffer from positive spherical aberration when unaccommodated, which tends to negative spherical aberration upon accommodation²-⁴. For positive spherical aberration, rays passing through the periphery of the pupil intercept the optical axis in front of the rays passing nearer the centre of the pupil.

© 1992 Optical Society of America