Simulation of eye's wavefront aberration measurement based on annular radial shearing interferometry

A new method is proposed to measure the wavefront aberration of human eyes based on annular radial shearing interference technology in this paper. The feasibility and accuracy of the scheme are verified by implementing simulations of four typical model eyes on ZEMAX. The proposed scheme consists of an illumination light path and an annular radial shearing interference system. The light path focuses the laser with a diameter of about 1 millimeter on the macula of the simulated human eye to form a point. Afterwards, the reflected light passes through the simulated eye refraction system to be incident in the annular radial shearing interference system in the form of wavefront aberration. Then the interference system contracts and expands the beam that carries wavefront aberration of the simulated eye to generate interference within their common area to obtain annular radial shearing interference patterns. Zernike polynomials are used as the basis functions to calculate the Zernike coefficients of the phase difference wavefront after image processing. Accordingly, the trial wavefront is reconstructed by iterative method, and is compared with that of corresponding model eye constructed by ZEMAX to calculate the error and validate the exactness eventually.