IN VIVO MEASUREMENT OF OCULAR ABERRATIONS WITHA DISTORTED GRATING WAVEFRONT SENSOR

摘要

Kestrel Corporation with the collaboration of City University is in the process ofdemonstrating a novel methodology to measure in vivo ocular aberrations that employs aDistorted Grating Wavefront Sensor (DGWFS) as a more efficient alternative to the wellknown Shack Hartmann (SH) wavefront sensing technique. The SH sensor is the mostcommon sensor available to measure ocular aberrations. However, the SH sensor'sdynamic range is limited, very sensitive to opacities, and to retinal and intraocularscattering. An alternative sensor is the DGWFS. The performance of the DGWFS isrelatively unaffected by opacities, scattering and speckle. Also it has an added advantageof an extended dynamic range whilst maintaining high sensitivity allowing high precisionmeasurements to be made without the need for complex defocus and astigmatismcorrection. The DGWFS was used to take in vivo measurements in a laboratoryenvironment. Seven eyes, from four subjects were successfully measured with thesystem. Dynamic measurements of accommodation were recorded with targets atdistances ranging from 0.25 to 3.2 meters from the subject's eye.