Results 211 to 220 of about 12,483 (262)

Accommodative response to ocular surface pain

Clinical and Experimental Optometry, 2021
The discovery of an accommodative response to ocular surface stimulation could inform clinicians and patients that optical effects may occur due to ocular discomfort and perhaps an assessment of the accommodative system after carrying out interventions impacting the ocular surface, may be warranted.There have been no previous reports evaluating the ...
Emmanuel B Alabi, Trefford L Simpson
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Changes of ocular aberration with accommodation

American Journal of Ophthalmology, 2002
To study the effect of accommodation on ocular aberrations.Observational case series.The ocular aberrations in 33 eyes of 33 young adults were measured with a Hartmann-Shack wavefront aberrometer before and during 3 diopters of accommodation.The root mean square values of wavefront error did not change for a 4-mm and a 6-mm zone; however, spherical ...
Sayuri Ninomiya, Takashi Fujikado, Teruhito Kuroda, Naoyuki Maeda, Yasuo Tano, Tetsuro Oshika, Yoko Hirohara, Toshifumi Mihashi   +7 more
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Spectral bandwidth and ocular accommodation

Journal of the Optical Society of America A, 1995
Previous studies have suggested that targets illuminated by monochromatic (narrow-band) light are less effective in stimulating the eye to change its focus than are black-white (broadband) targets. The present study investigates the influence of target spectral bandwidth on the dynamic accommodation response in eight subjects. The fixation target was a
K R, Aggarwala, E S, Kruger, S, Mathews, P B, Kruger   +3 more
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The Effect of Accommodation on Ocular Shape

Optometry and Vision Science, 2002
ABSTRACT: Purpose. Ocular shape is altered in myopia, and accommodation during nearwork is a proposed risk factor for myopia. Using relative peripheral refractive error (RPRE), ocular shape was assessed before, during, and after a period of sustained nearwork to determine whether accommodation ...
Terry W, Walker, Donald O, Mutti
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Ocular Aberrations and Accommodation

Ophthalmic and Visual Optics, 1992
It has been generally considered that on the visual axis in monochromatic light, the eye is limited only by diffraction effects for pupil diameters up to 2mm1 and thereafter is predominantly affected by spherical aberration. Most eyes are considered to suffer from positive spherical aberration when unaccommodated, which tends to negative spherical ...
David A. Atchison, Michael J. Collins, Christine F. Wildsoet   +2 more
openaire   +1 more source

Effect of accommodation of the lens on ocular pressure

Irish Journal of Medical Science, 1995
In a randomised single blind trial, eye pressures were significantly (p < 0.01) lower in a group (n=33) of subjects who read for 15 minutes than in a control group (n=33).
J, Blake, T, Horgan, P, Carroll, J, Stokes, P, Fitzpatrick   +4 more
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Perceptual detectability of ocular accommodation microfluctuations

Journal of the Optical Society of America A, 1989
When the eye fixates a stationary stimulus, the power of the lens is known to change rapidly and continuously. Although the basic characteristics of this fluctuating activity are known and the influencing factors have been identified, their exact role in the control of accommodation is uncertain. It is thought that, for the fluctuations to be useful, a
B, Winn, W N, Charman, J R, Pugh, G, Heron, A S, Eadie   +4 more
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Changes in ocular dimensions and refraction with accommodation

Ophthalmic and Physiological Optics, 1997
The purpose of this study was to measure the changes in ocular dimensions with accommodation, with particular reference to the radius of curvature of the posterior surface of the crystalline lens. The increase in power of the eye with accommodation is considered to arise primarily from a decrease in the radius of curvature of the anterior surface of ...
L F, Garner, M K, Yap
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Ocular Accommodation in Human Infants

Optometry and Vision Science, 1983
ABSTRACT The present longitudinal investigation evaluated the proficiency of the human ocular accommodation system during the 20‐week period after birth. Fourteen human infants were tested at specific intervals during the age of 2 through 20 weeks.
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Ocular Accommodation, Personality, and Autonomic Balance

Optometry and Vision Science, 1983
ABSTRACT The autonomic nervous system is made up of two subsystems: the parasympathetic (PNS) and the sympathetic (SNS). The balance between these systems regulates bodily functions during routine (PNS‐dominant) and crisis (SNS‐dominant) situations.
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