Physical Explanation of Diffractive Multifocal Lenses

Abstract

Improvement of the design and production technology of diffraction-type multifocal intraocular lenses has produced lenses with superior performance that are now used widely. It is important for users and designers of a lens to understand the optical structure and performance. Here, a physical explanation of the optical characteristics of the transmission-type blazed diffraction grating is given step-by-step and without use of numerical formulae.