Abstract
We have measured the ocular transverse chromatic aberration (TCA) in 11 subjects using 2D-two-color Vernier alignment, for two pupil diameters, in a polychromatic adaptive optics (AO) system. TCA measurements were performed for two pupil diameters: for a small pupil (2-mm), referred to as 'optical TCA' (oTCA), and for a large pupil (6-mm), referred to 'perceived TCA' (pTCA). Also, the TCA was measured through both natural aberrations (HOAs) and AO-corrected aberrations. Computer simulations of pTCA incorporated longitudinal chromatic aberration (LCA), the patient's HOAs measured with Hartmann-Shack, and the Stiles-Crawford effect (SCE), measured objectively by laser ray tracing. The oTCA and the simulated pTCA (no aberrations) were shifted nasally 1.20 arcmin and 1.40 arcmin respectively. The experimental pTCA (-0.27 arcmin horizontally and -0.62 vertically) was well predicted (81%) by simulations when both the individual HOAs and SCE were considered. Both HOAs and SCE interact with oTCA, reducing it in magnitude and changing its orientation. The results indicate that estimations of polychromatic image quality should incorporate patient's specific data of HOAs, LCA, TCA & SCE.
Highlights
In polychromatic light, the retinal image is affected by both monochromatic and chromatic aberrations of the eye and their interactions [1]
We found that the Transverse Chromatic Aberration (TCA) was systematically shifted nasally for small pupils and that the presence of monochromatic aberrations produced an intersubject spread of the perceived TCA
We found that incorporating an apodized pupil given by the individual Stiles-Crawford effect (SCE) produced accurate predictions of the experimental perceived TCA
Summary
The retinal image is affected by both monochromatic and chromatic aberrations of the eye and their interactions [1]. Simonet and Campbell [14] coined the term optical TCA (oTCA) to refer to the TCA that is measured with a small centered pupil and, not affected by the Higher Order Monochromatic Aberrations (HOAs) of the eye and by the Stiles-Crawford effect. They used the term perceived TCA (pTCA) to refer to the effective TCA with large pupils. The full spot diagrams for blue and red were used to calculate the pTCA (affected by the ocular aberrations, and following a weighting function, the Stiles-Crawford effect)
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