Abstract
We designed and built a fast scanning peripheral Hartmann-Shack (HS) wave-front sensor to measure the off-axis wave-front aberrations in the human eye. The new instrument is capable of measuring the optical quality over the central 80° horizontal visual field in 1.8 seconds with an angular resolution of 1°. The subject has an open field of view without any moving elements in the line-of-sight and the head is kept in place by a head-chin rest. The same efficiency, reliability and measurement quality as the current static HS sensor were found but with much higher acquisition speed and comfort for the patients. This instrument has the potential to facilitate and improve future research on the peripheral optical quality of the eye in large groups of subjects.
Highlights
The interest in measuring the peripheral optical quality of the eye [1,2,3,4,5] has increased ever since the suggestion that a relative peripheral hyperopia may be a cue to develop myopia [6,7]
Available auto-refractors with an open field of view were used by modifying the fixation target and having the subject to turn the eye in different angles
A mechanical eye model consisting of a 25.4 mm lens with a rotating diffusing element in the focal plane of the lens and a 6 mm aperture was placed in the pupil plane (PP)
Summary
The interest in measuring the peripheral optical quality of the eye [1,2,3,4,5] has increased ever since the suggestion that a relative peripheral hyperopia may be a cue to develop myopia [6,7]. The availability of instruments measuring the peripheral optical quality in a fast and reliable manner is limited. Available auto-refractors with an open field of view were used by modifying the fixation target and having the subject to turn the eye in different angles. The effect of turning the eye has been considered to be negligible [16,17], data acquisition time remains a limiting factor and can have a negative influence when comparing data from different angles, especially when measuring eyes that are not under cycloplegia. To reduce the acquisition time and to improve the comfort of the subject, a scanning instrument is necessary, where the instrument is moving relative to the subject, as opposed to a static instrument, where the subject has to turn the eye during the series of measurements
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