System based on the contrast of Purkinje images to measure corneal and lens scattering.

Current methods to measure intraocular scattering provide information on the total scattered light, which consists of the combined contributions originating from different ocular structures. In this work, we propose a technique for the objective and independent assessment of scattering caused by the cornea and the lens based on the analysis of the contrast of the third and fourth Purkinje images. The technique is preliminarily validated first by using artificial eyes with different levels of corneal and lens scattering; second, it is validated in eyes wearing customized contact lenses to simulate corneal scattering and eyes with nuclear cataracts.

Double-pass technique and compensation-comparison method in eyes with cataract.

Purpose: To clinically assess the objective scatter index (OSI) obtained from double-pass images and the log(s) parameter measured with the direct compensation-comparison psychophysical technique in eyes with cataract.

Setting: Ophthalmology Service, Terrassa Hospital, Barcelona, Spain.

Design: Prospective observational case series.

Repeatability of aberrometric measurements with a new instrument for vision analysis based on adaptive optics.

Purpose: To evaluate intersession and intrasession repeatability of aberration data obtained with a new visual simulator based on adaptive optics, which includes a Hartmann-Shack aberrometer (Adaptive Optics Vision Analyzer; Voptica S.L., Murcia, Spain).