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

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 nm) and near-infrared (786.0 nm) lights were measured simultaneously for di®erent positions in the model eye. The chromatic wavefronts were converted into Zernike polynomials. The Zernike tilt coe±cient (¯rst term) was used to calculate the transverse chromatic aberration along the x-direction, while the Zernike defocus coe±cient (fourth term) was used to calculate the longitudinal chromatic aberration. The measurement and simulation data were consistent.

Measurement of Longitudinal Chromatic Aberration in the Last Crystalline Lens Surface Using Hartmann Test and Purkinje Images

“…The system processes the information and transforms the pattern information into Zernike coefficients. According to Yangchung et al [ 46 ], LCA can be calculated using Equation (11): where is the LCA (in diopter), is the blue light’s defocus, is the red light’s defocus, is the blue light’s coefficient defocus (in ), is the red light’s coefficient defocus (in ) and is the pupil radius.…”