Computer simulations of alternative LASIK ablation patterns were performed for corneal elevation maps of 13 real myopic corneas (range of myopia, -2.0 to -11.5 D). The computationally simulated ablation patterns were designed with biconic surfaces (standard Munnerlyn pattern, parabolic pattern, and biconic pattern) or with aberrometry measurements (customized pattern). Simulated results were co...

We study the Gouy phase of a scalar wavefield that is focused by a lens suffering from primary spherical aberration. It is found that the Gouy phase has different behaviors at the two sides of the intensity maximum. This results in a systematic increase of the successive wavefront spacings around the diffraction focus. Since all lenses have some amount of spherical aberration, this observation ...

66 CataraCt & refraCtive Surgery today euroPe SePtember 2012 The Munnerlyn ablation profiles first used in laser vision correction did not respect the normal prolate shape of the cornea. As a result, these profiles induced aberrations that reduced patients’ quality of vision. In recent years, enhanced understanding and technological adaptation to address spherocylindrical refractive error and h...

A systematic and quantitative analysis is given of the impact pupil aberrations on imaging performance in wavefront manipulation applications using adaptive optical elements. For practical case rotationally-symmetric types corrections, such as defocus or spherical aberration, analytical expressions induced are derived including their field dependence. Each aberration thereby related to specific...

A fast direct wavefront sensing method for dynamic in-vivo adaptive optical two photon microscopy has demonstrated. By using the direct wavefront sensing and open loop control, the system provides high-speed wavefront measurement and correction. To measure the wavefront in the middle of a Drosophila embryo at early stages, autofluorescence from endogenous fluorophores in the yolk were used as r...

PURPOSE To develop a corneal model to better explain how refractive surgery procedures induce spherical aberration. SETTING Department of Ophthalmology and Center for Visual Science, University of Rochester, Rochester, New York, USA. METHODS The preoperative cornea was modeled as a rotationally symmetric surface with various radii of curvature and asphericities. The postoperative cornea was...

PURPOSE The aim was to identify optical quality metrics predictive of visual performance in eyes with keratoconus and penetrating keratoplasty (PK) for keratoconus. METHODS Fifty-four participants were recruited for this prospective, cross-sectional study. Data were collected from one eye of each participant: 26 keratoconus, 10 PK and 18 normal eyes: average age (mean +/- standard deviation) ...

A widespread type of multifocal intraocular lens (MIOL) is based on expanding the depth of focus with specific amounts of spherical aberration. However, knowing the optimal wavefront aberration for multifocality does not directly provide a MIOL geometry. To overcome this issue, we present a new strategy to design MIOLs. The method optimizes directly the IOL surface geometries (aspheres with asp...

Diffractive optical elements suffer from large chromatic aberration due to the strong wavelength-dependent nature in diffraction phenomena, and therefore, diffractive elements can work only at a single designed wavelength, which significantly limits the applications of diffractive elements in imaging. Here, we report on a demonstration of a wavefront coded broadband achromatic imaging with diff...