Fundamentals of Irregular Astigmatism and Clinical Research (4-2)　Chromatic Aberration in Clinical Situation

Abstract

Chromatic aberration is related to the visual and physiological functions of the eye in various aspects. In human optics, the cornea and lens are the eye structures mainly related to chromatic aberration. In pseudophakic eyes, the difference in chromatic aberration due to the difference of the intraocular lens material may affect visual function. Recently, it was reported that the hybrid singlet achromatic IOL design, with a combination refractive and diffractive surfaces for resolving spherical and chromatic aberration problems, improved the optical quality and that the polychromatic modulation transfer function (MTF) in an eye with a centered, not tilted achromatic IOL was near the diffraction-limited MTF. However, reduction of chromatic aberration would contribute not only to increase in contrast of the retinal image, but also to decrease in depth of field. Further investigation is therefore needed, so as to decide whether or not chromatic aberration should be controlled.