ABSTRACT:
The interest in the eye’s off-axis aberrations has increased strongly. On-axis the conversion of the aberration magnitude
between different wavelengths is well known. We verified if this compensation is correct also for off-axis
measurements by building a wavelength tunable peripheral Hartmann–Shack sensor and measuring 11 subjects
out to 30° in the horizontal visual field. At the fovea, an average longitudinal chromatic aberration of 1D between
red (671nm) and blue (473nm) light was found, and it increased slightly with eccentricity (up to 1:2D). A similar
trend was measured for astigmatism as a function of wavelength (increase ∼0:15D). Computational ray tracing in
model eyes showed that the origin of the small increase of chromatic aberrations with eccentricity is the change of
the oblique power of the refractive surfaces in the eye. Factors related to increase of axial length and refractive
index of the eye were found to have a very small influence. © 2011 Optical Society of America
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