Abstract

Longitudinal Chromatic Aberration (LCA) influences the optical quality of the eye. However, the reported LCA varies across studies, likely associated to differences in the measurement techniques. We present LCA measured in subjects using wavefront sensing, double-pass retinal images, and psychophysical methods with a custom-developed polychromatic Adaptive Optics system in a wide spectral range (450-950 nm), with control of subjects' natural aberrations. LCA measured psychophysically was significantly higher than that from reflectometric techniques (1.51 D vs 1.00 D in the 488-700 nm range). Ours results indicate that the presence of natural aberrations is not the cause for the discrepancies across techniques.

Highlights

  • The retinal image quality is degraded by the presence of monochromatic and polychromatic aberrations in the ocular optics

  • It has been suggested that monochromatic aberrations play a protective role against chromatic aberrations [9], which may explain why achromatizing lenses [10, 11] aimed at correcting Longitudinal Chromatic Aberration (LCA) in the eye do not noticeably improve visual performance, unless both chromatic and monochromatic aberrations are corrected [12]

  • Residual RMS upon Adaptive Optics (AO)-correction was lower than 0.05 μm

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Summary

Introduction

The retinal image quality is degraded by the presence of monochromatic and polychromatic aberrations in the ocular optics. The visual world is polychromatic and the study of the impact of retinal image quality on vision should consider the aberrations in the visible light, as well as the effect of chromatic aberrations. Chromatic effects in the eye arise from the wavelength-dependence on the refractive index of the ocular media (chromatic dispersion), affecting diffraction, scattering and aberrations [1,2,3]. Optical irregularities, misalignments between the ocular components and the off-axis position of the fovea result in a transversal shift of focus for different wavelengths, known as Transverse Chromatic Aberration (TCA) [5,6,7,8]. The retinal image quality is affected by interactions between monochromatic and chromatic aberrations. It has been suggested that monochromatic aberrations play a protective role against chromatic aberrations [9], which may explain why achromatizing lenses [10, 11] aimed at correcting LCA in the eye do not noticeably improve visual performance, unless both chromatic and monochromatic aberrations are corrected [12]

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