We compared aberrations produced by an axicon and a lens. Using the wave aberration theory and the point spread function of a coherent system, we analyzed and compared the light intensity distributions of the spot created by an axicon and by a lens aberrated by astigmatism and coma. We also experimentally observed the aberrated light spots created by an axicon. We found that the beam spot of an...

PURPOSE To assess the compensation of total ocular and corneal wavefront aberrations after conventional myopic LASIK. METHODS This study comprised 57 eyes of 57 patients. Total and corneal aberrations were measured preoperatively and 3 months postoperatively using the OPD-Scan (NIDEK Co Ltd) aberrometer. Total and corneal aberrations root-mean-square (RMS) was calculated out to the 6th Zernik...

PURPOSE To study the relationship between visual acuity (VA) and the eye's optical quality in subjects with normal and excellent spatial vision. VA ranged from decimal values of 1.0 (20/20) to 2.0 (20/10) when defocus and astigmatism were carefully corrected. METHODS In 60 eyes of young subjects, visual and optical performance with the natural pupil were measured. A forced-choice procedure wa...

Objective: To compare corneal aberrations and densitometry values in children with amblyopia due to anisometropic hyperopia those of healthy children.
 Methods: This study included 173 hyperopic anisometropia one eye both eyes. The amblyopic (Group 1) the fellow normal 2) patients right control group 3) were evaluated. Of aberration (CD)measured using Scheimpflug topography noted.
 Re...

Purpose To investigate the reliability of ocular aberration measurement in myopic children under scotopic conditions and to validate the mathematical Zernike pupil scaling-down technique. Methods Ocular aberrations of 45 myopic children were examined under scotopic conditions via iTrace aberrometer. The intra- and intersession repeatability was evaluated for both the measured values with the ...

PURPOSE To characterize and measure the ocular aberrations in eyes implanted with monofocal intraocular lenses (IOLs) and to study any correlation between postoperative aberrations and surgical factors. METHODS A Tscherning aberroscope was used to measure the wavefront aberrations of 62 eyes that had undergone phacoemulsification with the implantation of foldable monofocal Acrysof MA60BM IOLs...

We report the main parameters of a nine-electrode bimorph piezoelectric adaptive mirror designed to correct low-order aberrations. We describe measurements of the control coefficients for defocus, astigmatism, pure coma, and spherical aberration of this mirror and the temperature stability of its profile. The performance of a simple adaptive optical system for imaging through laboratory-generat...

BACKGROUND Complaints of glare, halos, and disturbances of night vision after photorefractive keratectomy (PRK) probably result from changes in the corneal aberration structure induced by the laser ablation procedure. The purpose of this article is to characterize changes in the corneal aberration structure after PRK and to demonstrate the effect of pupil dilation on these changes. METHODS Vi...

The point spread function (PSF) produced by a coherent optical system under the influence of defocus, coma, and primary spherical aberration (PSA) is examined in this work. This paper deals with asymmetric apodization pupil engineering to control monochromatic aberrations. To reduce aberrations on diffracted PSF, approach uses amplitude phase apodization. Analytical investigations intensity PSF...

PURPOSE To determine changes in higher-order aberrations (HOAs) after corneal collagen crosslinking (CXL). SETTING Cornea and refractive surgery practice. DESIGN Prospective randomized controlled clinical trial. METHODS Corneal and ocular HOAs were measured and analyzed using the Pentacam device and Ladarwave aberrometer, respectively, at baseline and 12 months after CXL. RESULTS Ninety...