Results 261 to 270 of about 38,857 (309)
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American Journal of Ophthalmology, 2001
A DAPTIVE OPTICS WAS FIRST SUGGESTED IN 1953 BY astronomer Horace Babcock to remove the blurring effects of turbulence in the atmosphere on telescopic images of stars.1 The U.S. Defense Department later invested heavily in the development of adaptive optics technology to improve the effectiveness of laser weapons as part of its Star Wars Program.
S M, MacRae, D R, Williams
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A DAPTIVE OPTICS WAS FIRST SUGGESTED IN 1953 BY astronomer Horace Babcock to remove the blurring effects of turbulence in the atmosphere on telescopic images of stars.1 The U.S. Defense Department later invested heavily in the development of adaptive optics technology to improve the effectiveness of laser weapons as part of its Star Wars Program.
S M, MacRae, D R, Williams
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Nonparametric narrowband wavefront estimation from wavefront gradients
IEEE Transactions on Signal Processing, 1999The wavefield sampled by a two-dimensional (2-D) planar array can he characterized by a delayed signal. This correspondence investigates the problem of the nonparametric estimation of the delay function (or wavefront) when the waveform is narrowband. The wavefront is estimated by integrating the local estimates of the differential time of delay (TOD ...
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Wavefront reconstruction for the Shack-Hartmann wavefront sensor
SPIE Proceedings, 2002The Shack-Hartmann wavefront sensor is a powerful tool for optical analysis. A vital step in the data analysis chain involves reconstructing the wavefront incident upon the lenslet array from hundreds or thousands of slope measurements. We discuss here the basics of reconstruction and the differences in reconstruction for the case of Hartmann and Shack-
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Journal of Cataract & Refractive Surgery, 2021
Scott M, MacRae, Geunyoung, Yoon
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Scott M, MacRae, Geunyoung, Yoon
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The optics of wavefront sensing
Ophthalmology Clinics of North America, 2004This article reviews the fundamental principles by which wavefront aberrometers measure ocular aberrations. Three different ways of interpreting aberration measurements are described in terms of wavefront phase, slope, and curvature. Although curvature is the more familiar concept from geometrical optics, the wave optics concept of wavefront phase is ...
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Multilcolor Wavefront Reconstruction
Applied Optics, 1967Two and three primary colors derived from an He-Ne gas laser and an argon gas laser were employed in recording and reconstructing holograms. For the tricolor case it is possible to reconstruct a three-dimensional multicolor image which possesses almost all the natural hues of the original object.
A A, Friesem, R J, Fedorowicz
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Active wavefront sensing and wavefront control with SLMs
SPIE Proceedings, 2004Active systems are becoming more and more prevalent in the the field of optical technology. These systems require not only means of controlling wavefronts but mostly also of sensing wavefronts. This paper shows in four examples how spatial light modulators can be utilized to perform active wavefront sensing and wavefront controlling tasks. The examples
Jan Liesener +3 more
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Wavefront guided and custom wavefront refractive surgery
Acta Ophthalmologica, 2010AbstractAbstract not ...
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Wavefront sensing with an axicon
Optics Letters, 2011The use of a large apex-angle axicon for common-path interferometric wavefront sensing is proposed. The approach is a variant of point-diffraction interferometry bearing similarities to pyramidal wavefront sensing. A theoretical basis for wavefront sensing with an axicon is developed, and the outcomes of numerical simulations are compared to ...
Brian, Vohnsen +2 more
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Wavefront technology in ophthalmology
Current Opinion in Ophthalmology, 2001Wavefront sensing is an emerging technology that can measure irregular astigmatism as a higher-order wavefront aberration. The application of wavefront sensing in ophthalmology might enable the non-invasive observation of living retinal cone cells; the measurement of detailed visual function of the central nervous system by eliminating higher-order ...
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