ABERRATION, SPHERICAL

A lens defect whereby image forming rays of one colour, passing through the outer zones of a lens come to focus at a various distance from the lens than do those of more central rays. With a simple spherical (or plano-spherical) lens the outer rays always meet the axis closer to the lens than do more central rays and the lens is uncorrected or undercorrected. When the reverse is true the lens has been overcorrected.

Refetoff, S Refetoff syndrome refine reflect reflected colours reflected inguinal ligament reflected light reflected ray (0)