Results 331 to 340 of about 415,852 (378)

Modification of pattern reversal VERs by ocular accommodation

Vision Research, 1985
The amplitudes and implicit times of the P-1 component of monocular transient pattern VERs elicited by reversing checkerboard targets were measured in 6 conditions: (1) Ocular accommodation (Ao) elicited by minus power ophthalmic lenses; (2) Ao stimulated by minus lenses with the natural pupil of the test eye dilated and replaced by an artificial pupil;
Marlee M. Spafford, J.V. Lovasik, M. Szymkiw   +2 more
openaire   +3 more sources

Volume change of the ocular lens during accommodation

American Journal of Physiology-Cell Physiology, 2007
During accommodation, mammalian lenses change shape from a rounder configuration (near focusing) to a flatter one (distance focusing). Thus the lens must have the capacity to change its volume, capsular surface area, or both. Because lens topology is similar to a torus, we developed an approach that allows volume determination from the lens cross ...
D. P. Escobar, Oscar A. Candia, Aldo C. Zamudio, Rosana Gerometta   +3 more
openaire   +3 more sources

Change in Accommodation and Ocular Aberrations in Keratoconus Patients Fitted With Scleral Lenses

Eye & contact lens, 2016
Purpose: To evaluate the accommodative response to different accommodative stimulus and to determine the changes in ocular higher-order aberrations with accommodation in keratoconus patients fitted with mini scleral lenses.
E. Yildiz, Meltem Toklu, E. Vural, N. Yenerel, H. Bardak, E. Kumral, Y. Bardak   +6 more
semanticscholar   +1 more source

The influence of coloured lighting on ocular amplitude of accommodation

Fourth International Conference on Applications of Optics and Photonics, 2019
The lighting systems that is used in our daily tasks are an important factor in our vision quality. These systems must be suitable to the visual needs required by these type of tasks. The aim of this work is to evaluate the influence of coloured lighting on ocular accommodation and quantify its response with the lighting used.
Franco, Sandra, Moreira, Raquel, Linhares, João M. M.   +2 more
openaire   +3 more sources

Accommodative and Vergence Findings in Ocular Myasthenia

Journal of Neuro-ophthalmology, 2000
Myasthenia gravis (MG) is a neuromuscular disorder that affects skeletal muscles, in particular, the extraocular muscles. Response variability is a hallmark sign. Detailed findings are described in a patient with MG in which the presenting sign was accommodative insufficiency.
Gayle J. Pollak, Jerome Feldman, Kenneth J. Ciuffreda, Philip B. Kruger, Jeffrey Cooper   +4 more
openaire   +2 more sources

Evolution of accommodative function and development of ocular movements in children [PDF]

Ophthalmic and Physiological Optics, 2003
AbstractThe evolution of the accommodative function and development of ocular movement are evaluated in a non‐clinical paediatric population (1056 subjects) aged 6–12 years, providing means for each age in the optometric tests that evaluate the accommodative amplitude, accommodative facility, accommodative response (lag), and saccadic movements.
Jose A. García, M A Pérez, M D González, Raimundo Jiménez   +3 more
openaire   +2 more sources

Behavior of identified Edinger-Westphal neurons during ocular accommodation.

Journal of Neurophysiology, 1994
1. The present study used single-unit recording and antidromic activation techniques in alert rhesus monkeys to examine the static and dynamic behavior of 21 parasympathetic, preganglionic neurons of the Edinger-Westphal nucleus (EW) during ocular ...
Paul D. Gamlin, Y. Zhang, R. Clendaniel, L. Mays   +3 more
semanticscholar   +1 more source

The Effect of Latanoprost on Accommodation in Young Patients with Ocular Hypertension

Journal of Glaucoma, 2003
To determine whether topical latanoprost 0.005% had an effect on accommodative capacity after 1 month of treatment in young patients with ocular hypertension.Fifteen patients (9 men and 6 women, aged 20-40 years) with ocular hypertension were instructed to instill the drug to their right eye for 1 month; the left eye received no medication and served ...
Levi Rothkoff, Shimon Kurtz, Gabi Shemesh, Igal Leibovitch, Anat Loewenstein   +4 more
openaire   +3 more sources

Single-unit activity in the primate nucleus reticularis tegmenti pontis related to vergence and ocular accommodation.

Journal of Neurophysiology, 1995
1. In the present study we used single-unit recording techniques in alert rhesus monkeys to investigate a precerebellar nucleus, the nucleus reticularis tegmenti pontis (NRTP), for neurons related to vergence and ocular accommodation. 2.
Paul D. Gamlin, R. Clarke
semanticscholar   +1 more source

Changes in Ocular Astigmatism Over the Whole Range of Accommodation

Optometry and Vision Science, 1991
The refraction of 20 subjects was measured over the whole range of accommodation using an objective automated refractometer in order to investigate the astigmatic change whose origin is presumed to be at the lens. For this purpose, the corneal vertex was used as the plane of reference to avoid changes in the optical effectively of a cylindrical lens at
Yuichi Ichihashi, Kazuhiko Ukai
openaire   +3 more sources