Microfluctuations of accommodation have been the subject of many studies. New technological developments now permit us to study the dynamics of the microfluctuations with unprecedented resolution and accuracy. We aim to characterise their temporal statistics for different levels of accommodative effort, using a custom-built aberrometer. We conducted 46 s long measurements on the dominant eye of...

PURPOSE To provide a detailed assessment of the techniques, technical features, and practical use of 6 aberrometers made available to our institution from September 2002 to January 2004. SETTING Department of Ophthalmology, University Hospital Antwerp, Antwerp, Belgium. METHODS A number of technical and practical parameters are listed for the Visual Function Analyzer (Tracey), the OPD-scan ...

Given the relationship between spherical aberrations and accommodation, study of these can be helpful to understand accommodative response in subjects with dysfunctions. The purpose this was evaluate on-axis off-axis changes primary secondary aberrations, Z(4,0) Z(6,0), accommodation insufficiency (AI). Ten AI eleven without any dysfunction (control) participated study. On-axis defocus Z(2,0), ...

Abstract Coma is one of the most common ocular higher order aberrations and highly affects quality image. It assumed that corneal are balanced by internal (lenticular) so retinal image may not have great impact. However, during accommodation, shape, position, curvature crystalline lens changes which might disrupt this balance between aberration. This study aimed to investigate effect accommodat...

Higher order optical aberrations were measured in 273 cyclopleged Singaporean school children using a Bausch and Lomb Zywave aberrometer, with 268 of these subjects also undergoing corneal topography measurements (Tomey TMS 2 system). Subjects with low myopia (> -3.00 to -0.50 D) showed slightly, but significantly, less positive levels of spherical aberration than other refractive error groups....

The time-evolution of ocular aberrations has been the subject of many studies, but so far there has been little discussion involving the modelling of the underlying temporal statistics. This paper presents a non-stationary modelling approach based on a coloured-noise generator, which can be applied to ocular aberration dynamics. The model parameters are computed from measured ocular aberration ...

Knowledge of the effect accommodation on image quality peripheral retina is crucial for better understanding visual system, but only a few studies have been carried out in this area. This study was designed to evaluate higher order aberrations from third sixth Zernike polynomials central and up 23° off-axis. We used Hartmann–Shack aberrometer measure coefficients with both accommodated non-acco...

Purpose: This study aimed to investigate and compare the changes in corneal aberrations accommodative amplitudes between patients with multiple sclerosis normal individuals. Methods: We included 20 who were previously diagnosed optic nerve involvement (multiple group) healthy sex- age-matched individuals (control group). only selected those under 40 years old because accommodation over signific...