Abstract
Peripheral vision and off-axis aberrations not only play an important role in daily visual tasks but may also influence eye growth and refractive development. Thus it is important to measure off-axis wavefront aberrations of human eyes objectively. To achieve efficient measurement, we incorporated a double-pass scanning system with a Shack Hartmann wavefront sensor (SHWS) to develop a scanning Shack Hartmann aberrometer (SSHA). The prototype SSHA successfully measured the off-axis wavefront aberrations over +/− 15 degree visual field within 7 seconds. In two validation experiments with a wide angle model eye, it measured change in defocus aberration accurately (<0.02μm, 4mm pupil) and precisely (<0.03μm, 4mm pupil). A preliminary experiment with a human subject suggests its feasibility in clinical applications.
Highlights
Peripheral vision plays an indispensible role in daily visual tasks such as driving [1, 2] and locomotion [3]
Measurement precision, as specified by the standard deviations of the measured defocus change, was 0.02 μm, 0.03 μm, and 0.03 μm respectively. These precision values are larger than those reported for a commercial, non-scanning aberrometer [28] but are of the same order of magnitude as the variability in human eye measurements taken under comparable conditions [18]
In the evaluation experiment with a human eye, the mean root-mean-square error of such deviations (RMSDev) of the five repetitive measurements across the non-horizontal LoS is 0.14 μm. This low value suggests that scanning Shack Hartmann aberrometer (SSHA) is a feasible and reliable instrument to be applied in clinical research and diagnosis
Summary
Peripheral vision plays an indispensible role in daily visual tasks such as driving [1, 2] and locomotion [3]. Visual acuity for spatial resolution tasks declines rapidly in the peripheral visual field, visual acuity for detecting spatial patterns and objects declines only slightly in the periphery [4, 5]. Clinical interest in peripheral vision has increased recently because peripheral optical aberrations (especially defocus) might be important for emmetropization and myopia development [8,9,10,11,12]. Taken together, these studies demonstrate the importance of peripheral optical quality of the human eye. It is essential that methods be developed to measure peripheral optical quality (e.g. off-axis wavefront aberrations) objectively
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