Simultaneous quantification of longitudinal and transverse ocular chromatic aberrations with Hartmann–Shack wavefront sensor

Yangchun Deng,Yun Dai,Yudong Zhang,Junlei Zhao

doi:10.1142/s1793545818500219

Abstract

A simple method to objectively and simultaneously measure eye’s longitudinal and transverse chromatic aberrations was proposed. A dual-wavelength wavefront measurement system using two Hartmann–Shack wavefront sensors was developed. The wavefronts of the red (639.1[Formula: see text]nm) and near-infrared (786.0[Formula: see text]nm) lights were measured simultaneously for different positions in the model eye. The chromatic wavefronts were converted into Zernike polynomials. The Zernike tilt coefficient (first term) was used to calculate the transverse chromatic aberration along the [Formula: see text]-direction, while the Zernike defocus coefficient (fourth term) was used to calculate the longitudinal chromatic aberration. The measurement and simulation data were consistent.

Highlights

Optic errors of the human eye are divided into monochromatic and chromatic aberrations
Monochromatic-aberration measurements and adaptive optics (AO) aberration correction of the human eye have been performed since 1997.1 This technique has been widely used in high-resolution retinal imaging and vision studies
In order to eliminate the negative in°uence of the chromatic aberrations in multi-wavelength imaging and design of achromatic intraocular lens (IOL),[9,10] it is necessary to study the chromatic aberrations of the human eye

Summary

Introduction

Optic errors of the human eye are divided into monochromatic and chromatic aberrations. Monochromatic-aberration measurements and adaptive optics (AO) aberration correction of the human eye have been performed since 1997.1 This technique has been widely used in high-resolution retinal imaging and vision studies. Wald and Gri±n employed a specially designed spectral stigmatoscope to measure LCA of the eye using a subjective method. In 1998, Rynders et al employed a double-pass apparatus to measure the o®-axis LCA using both subjective and objective methods in the visible-light range. The average LCA tends to increase gradually between 458 nm and 632.8 nm, from $ 1:0 D at the fovea to approximately 1.6 D at an eccentricity of 40.12 In 1999, Marcos et al employed a spatially resolved refractometer to measure the LCA objectively in the visible range. In 2008, Manzanera et al employed an HS wavefront sensor and Xe-white-light lamp to measure the LCA (440– 694 nm) using an objective method. The average LCA of three subjects was smaller than 2.0 D.15

Methods

Results

Discussion

Conclusion