Measuring phase aberrations using a pyramid wave front sensor
2010
The pyramid wavefront sensor (PWS) was initially proposed by astronomers to measure aberrations introduced
by the atmosphere. More recently it has been used to measure aberrations of the human eye, and has been
successfully incorporated into an adaptive optics loop to correct those aberrations. The raw sensor signal can
be used as feedback to control a wavefront correcting device, or with appropriate scaling, to reconstruct the
wavefront map in the pupil. In practice, use of dynamic modulation allows one to tune the sensitivity and range
of the sensor to best suit the particular application. We describe a PWS primarily designed to perform in-vivo
measurements of human eyes. The sensor is calibrated over a wide range of settings allowing one to choose those
best suited to a specific task. For example, enhanced-sensitivity measurements of very small aberrations require
small range (closed loop adaptive optics). Alternatively, if one wants to measure the aberrations of the eye
without any correction, the range required is subject-dependent and can be large; the price paid is in reduced
sensitivity . We present in-vivo measurements of human eyes taken at a number of experimental settings and
compare the performance of the PWS at each.
Keywords:
- Correction
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