Results 301 to 310 of about 420,660 (342)

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
openaire   +2 more sources

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

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
openaire   +2 more sources

Effect of migraine attack on pupil size, accommodation and ocular aberrations

European Journal of Ophthalmology, 2020
Purpose: To evaluate the pupil size, accommodation, and ocular higher-order aberrations (HOAs) in patients with migraine during migraine attacks and compare them with interictal period and healthy controls.
M. B. Yıldız, E. Yildiz, Sevcan Balci, B. H. Hasırcı Bayır, Y. Çetinkaya   +4 more
semanticscholar   +1 more source

Neural Control of Vergence and Ocular Accommodation.

Annual Review of Vision Science
We review the current state of our knowledge of the neural control of vergence and ocular accommodation in primates including humans. We first describe the critical need for these behaviors for viewing in a three-dimensional world.
Julie Quinet, Kevin Schultz, Paul J May, Paul D. Gamlin   +3 more
semanticscholar   +1 more source

The Effect of Accommodation on Ocular Shape

Optometry and Vision Science, 2002
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 affects ocular shape.Measurements of RPRE at 30 degrees in the nasal visual ...
Terry W, Walker, Donald O, Mutti
openaire   +2 more sources

Status of Residual Refractive Error, Ocular Aberrations, and Accommodation After Myopic LASIK, SMILE, and TransPRK.

Journal of refractive surgery, 2019
PURPOSE To analyze residual refractive error, ocular aberrations, and visual acuity (VA) during accommodation simultaneously with ocular aberrometry in eyes after laser-assisted in situ keratomileusis (LASIK), small incision lenticule extraction (SMILE),
Naren Shetty, Zelda Dadachanji, Raghav Narasimhan, G. Kundu, P. Khamar, P. Ahuja, Vijaya Kumar, Vikas Kumar, R. Shetty, R. Nuijts, Abhijit Sinha Roy   +10 more
semanticscholar   +1 more source

Accommodative Esotropia After Ocular and Head Injury

American Journal of Ophthalmology, 1990
Five children lost their ability for motor fusion after traumatic injury to either the eye or head. All patients had the onset of accommodative esotropia within two months of the traumatic episode. The ocular alignment of each child was controlled by the use of spectacles that corrected the accommodative requirements.
openaire   +2 more sources

Ocular Component Correlates of Tonic Accommodation

Ophthalmic and Visual Optics, 1992
Tonic accommodation (TA) and its adaptation have attracted considerable interest in recent years as putative risk factors for myopia (Ebenholtz, 1983) and TA is currently under investigation in prospective studies of adults (McBrien and Adams, 1989). TA has been widely studied as a function of refractive error. Maddock et al.
Donald O. Mutti, Karla Zadnik, Anthony J. Adams   +2 more
openaire   +1 more source

Ocular accommodation in chickens: Corneal vs lenticular accommodation and effect of age

Vision Research, 1986
The avian accommodative response has long been suspected of having a corneal component resulting from contraction of a limbal extension of the ciliary muscle. Efforts to confirm the existence of such a mechanism have been sporadic and the results contradictory.
J G, Sivak, T E, Hildebrand, C G, Lebert, L M, Myshak, L A, Ryall   +4 more
openaire   +2 more sources