Fundamentals of Irregular Astigmatism and Clinical Research (5-2)　Higher-Order Aberration

Abstract

Monocular diplopia or monocular triplopia is occasionally complained in young patients with cataract. Because the scattering in the lens is slight, higher-order aberration originating from the inhomogeneous refractive index in the lens may influence the retinal image. Monocular diplopia is explained by the combination of secondary astigmatism and spherical aberration, monocular triplopia by trefoil and spherical aberration. Cataract surgery is recommended if the subjective diplopia or triplopia is similar to the simulated retinal images and the corneal higher-order aberration is slight.