Results 241 to 250 of about 6,501 (284)

Making sense out of wavefront sensing

American Journal of Ophthalmology, 2005
a T p HE PRESENCE OF OPTICAL ABERRATIONS THAT BLUR retinal images were the subject of popular lectures by Helmholtz in the 1860s, and led him to state: Now, it is not too much to say that if an optician wanted o sell me an instrument which had all these defects, I hould think myself justified in blaming his carelessness in he strongest terms and giving
Jay S, Pepose, Raymond A, Applegate
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The optics of wavefront sensing

Ophthalmology Clinics of North America, 2004
This 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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The future of wavefront sensing and customization

Ophthalmology Clinics of North America, 2004
The possibility of achieving supernormal vision in terms of acuity and contrast has fueled the imagination and creativity of vision researchers to pursue the goal of customized wavefront refractive surgery. This goal is achieved by generating an optimal ablation pattern based on individual anatomical and functional characteristics of the treated eye ...
Shu-I, Yeh, Dimitri T, Azar
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A reference wavefront for wavefront sensing instruments

Workshop on Optical Fabrication and Testing, 1986
A reference light source (RLS) was designed to allow the measurement and removal of system wavefront errors in wavefront sensing instruments. The wavefront of the RLS is produced by collimating and re-focussing the output of a laser diode onto a 1 micron pinhole aperture.
Lars A. Selberg, Bruce E. Truax
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Comparison of wavefront sensing devices

Ophthalmology Clinics of North America, 2004
Wavefront measurement is an emerging technology that can evaluate low-order and high-order aberrations. This review compiles the different wavefront sensing devices and compares the most popular Hartmann-Shack aberrometers.
Kerry D, Solomon, Luis E, Fernández de Castro, Helga P, Sandoval, David T, Vroman   +3 more
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Holography-based wavefront sensing

Applied Optics, 2007
We describe a modal wavefront sensing technique of using multiplexed holographic optical elements (HOEs). The phase pattern of a set of aberrations is angle multiplexed in a HOE, and the correlated information is obtained with a position sensing detector.
F, Ghebremichael, Geoff P, Andersen, Kenneth S, Gurley   +2 more
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Active wavefront sensing and wavefront control with SLMs

SPIE Proceedings, 2004
Active 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, Lars Seifert, Hans J. Tiziani, Wolfgang Osten   +3 more
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Digital in-line holography for wavefront sensing

Optics and Laser Technology
Majid Panahi, Ahmad Darudi, Ali-Reza Moradi   +2 more
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Prism configurations for wavefront sensing

Applied Optics, 1990
This Technical Note mentions two prism configurations for wavefront sensing, both stimulated by works of Roddier. One implements an interferometric pupil-plane sensor, the other a noninterferometric wavefront curvature sensor.
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Asymmetric cryptography based on wavefront sensing

Optics Letters, 2006
A system of asymmetric cryptography based on wavefront sensing (ACWS) is proposed for the first time to our knowledge. One of the most significant features of the asymmetric cryptography is that a trapdoor one-way function is required and constructed by analogy to wavefront sensing, in which the public key may be derived from optical parameters, such ...
Xiang, Peng, Hengzheng, Wei, Peng, Zhang
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