We present a comprehensive study of the effect of detector sampling on wavefront-coded systems. Two important results are obtained: the spurious response ratios are reduced in wavefront-coded systems with a cubic phase mask and detector sampling does not compromise the restoration of wavefront-coded images with extended depth of field. Rigorous computer simulation of sampled wavefront-coded ima...

Wavefront aberrations in human eyes were measured with a Shack-Hartmann wavefront sensor. Based on the measured wavefront aberrations, customized optics, such as phase plates and a customized contact lens, were designed and fabricated to compensate for higher-order wavefront aberrations in human eyes. The fabricated customized optics could successfully correct higherorder aberrations in human e...

Wavefront algorithms are algorithms on grids where execution proceeds in a wavefront manner from the start to the end of the execution (execution moves through the grid as if a wavefront is moving). Many dynamic programming problems and stencil computations are wavefront algorithms. Iterative wavefront algorithms for evaluating dynamic programming (DP) recurrences exploit optimal parallelism, b...

Fourier Wavefront Reconstruction Over a Rectangular Pupil The iterative and boundary methods developed here for circular and elliptical pupils are based on a method to reconstruct the wavefront over the rectangular pupil. To fully understand this development, it is necessary to first summarize the approach used by Freischlad and Koliopoulos to derive an inverse spatial filter to reconstruct a w...

We propose a wavefront measurement method based on Talbot effect. It is well known that the wavefront of large aperture long focal lens is difficult to be measured. Here a new method for wavefront measurement of large aperture long focal lens is presented, which is accomplished by fitting the slope of sub-wavefront in the whole aperture while the sub-wavefront slope is got by calculating the sh...

PURPOSE To compare visual outcomes between wavefront-guided photorefractive keratectomy (PRK) and wavefront-guided laser in situ keratomileusis (LASIK). SETTING Academic center, Salt Lake City, Utah, USA. METHODS In this randomized prospective study, myopic eyes were treated with wavefront-guided PRK and or wavefront-guided LASIK using a Visx Star S4 CustomVue platform with iris registratio...

Both computer simulations and experiments have shown that fluorescent signals recorded in optical mapping experiments originate from a widely distributed three-dimensional volume of tissue located beneath the detection site (1). Scattering of photons from within this volume, which we term the scattering volume, leads to blurring of the optical signal and to a prolongation of the optical action ...

equivalent (MRSE) results were also similar, with 93% of wavefront-guided patients within 0.5 D of target, and 94% of wavefront optimized patients reaching this level. No eyes in this study lost 2 lines of BSCVA; in fact, most eyes gained BSCVA after surgery. In the wavefront-optimized group, 58% of eyes gained one line or more of vision compared with 62% of eyes in the wavefront-guided cohort....

We have recently been studying the performance of wavefront algorithms implemented using message passing on 2dimensional logical processor arrays [1,2]. Wavefront algorithms are ubiquitous in parallel computing, since they represent a means of enabling parallelism in computations that contain recurrences. Our particular interest in wavefront algorithms derives from their use in discrete ordinat...

We present a practical regular grid wave traveltime calculation that is based on Huygens wavefront expansion and grid traveltime mapping. Wavefront expansion is carried out by finite difference approximations to the equations that are equivalent to the Eikonal equation with a fixed time interval. Mapping traveltime from wavefront to regular grids is based on a dynamic ray tracing paraxial appro...