title: Large-dynamic-range Shack-Hartmann wavefront sensor for highly aberrated eyes.
abstract: A conventional Shack-Hartmann wavefront sensor has a limitation that increasing the dynamic range usually requires sacrificing measurement sensitivity. The prototype large-dynamic-range Shack-Hartmann wavefront sensor presented resolves this problem by using a translatable plate with subapertures placed in conjugate with the lenslet array. Each subaperture is the same size as a lenslet and they are arranged so that they overlap every other lenslet position. Three translations of the plate are required to acquire four images to complete one measurement. This method increases the dynamic range by a factor of two with no subsequent change in measurement sensitivity and sampling resolution of the aberration. The feasibility of the sensor was demonstrated by measuring the higher order aberrations of a custom-made phase plate and human eyes with and without the plate.
authors.affiliation: University of Rochester, Department of Ophthalmology, Biomedical Engineering and Center for Visual Science, New York 14627, USA. yoon@cvs.rochester.edu
authors.forename: Geunyoung
authors.initials: G
authors.lastname: Yoon
authors.forename: Seth
authors.initials: S
authors.lastname: Pantanelli
authors.forename: Lana J
authors.initials: LJ
authors.lastname: Nagy
mesh_terms: D019781:Corneal Topography / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005240:Feasibility Studies; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D007909:Lenses; D019721:Ophthalmoscopes; D012030:Refractive Errors / Q000175:diagnosis*; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers