Results 11 to 20 of about 73,863 (160)

Sharp vision: a prerequisite for compensation to myopic defocus in the chick?

Current Eye Research, 1998
PURPOSE: Compensatory responses to focusing errors imposed by spectacle lenses in chicks, tree shrews and primates leave little doubt that active emmetropization can occur, and debate is now centered on whether this process is uni-directional or bi ...
Nevin, Simon T., Wildsoet, Christine F., Schmid, Katrina L.   +2 more
core   +5 more sources

Eyes in various species can shorten to compensate for myopic defocus [PDF]

Investigative Opthalmology & Visual Science, 2013
Fulltext embargoed for: 6 months post date of publicationPURPOSE: We demonstrated that eyes of young animals of various species (chick, tree shrew, marmoset, and rhesus macaque) can shorten in the axial dimension in response to myopic defocus.
Smith, EL, McBrien, NA, Troilo, D, Wallman, J, Zhu, X   +4 more
core   +4 more sources

Inverting peripheral hyperopic defocus into myopic defocus among myopic schoolchildren using addition power of multifocal contact lens. [PDF]

Saudi J Ophthalmol, 2020
PURPOSE: The purpose was to determine the minimum near-addition power needed using Proclear® multifocal D-Design contact lens (adds: +1.50 D, +2.50 D, +3.00 D, and +3.50 D) to invert the pattern of relative hyperopic defocus in the peripheral retina into relative myopic defocus among the eyes of myopic schoolchildren.
Allinjawi K, Kaur S, Akhir SM, Mutalib HA.   +3 more
europepmc   +4 more sources

Relative Myopic Defocus in the Superior Retina as an Indicator of Myopia Development in Children. [PDF]

Invest Ophthalmol Vis Sci, 2023
To investigate the role of peripheral refraction in children's myopization.This 2-year study included 214 children (8-15 years old). Refraction across the retina (field of view: 60° × 36°) was measured with a custom-made aberrometer every year. Three datasets were established: dataset 1, 214 subjects from baseline to the first-year visit; dataset 2 ...
Lin Z, Xi X, Wen L, Luo Z, Artal P, Yang Z, Lan W.   +6 more
europepmc   +3 more sources

Short-Term Myopic Defocus and Choroidal Thickness in Children and Adults. [PDF]

Invest Ophthalmol Vis Sci
Studies report conflicting findings regarding choroidal thickness changes in response to myopic defocus in humans. This study aimed to investigate the choroidal response to myopic defocus in children and adults using automated analysis.Participants (N = 46) were distance-corrected in both eyes and viewed a movie on a screen for 10 minutes.
Ostrin LA, Sah RP, Queener HM, Patel NB, Tran R, Shukla D, Mirhajianmoghadam H.   +6 more
europepmc   +3 more sources

Brain Activation Induced by Myopic and Hyperopic Defocus From Spectacles [PDF]

Frontiers in Human Neuroscience, 2021
Purpose: To assess neural changes in perceptual effects induced by myopic defocus and hyperopic defocus stimuli in ametropic and emmetropic subjects using functional magnetic resonance imaging (fMRI).Methods: This study included 41 subjects with a mean age of 26.0 ± 2.9 years.
Meng-Tian Kang, Meng-Tian Kang, Bo Wang, An-Ran Ran, Jiahe Gan, Jiahe Gan, Jialing Du, Jialing Du, Mayinuer Yusufu, Xintong Liang, Xintong Liang, Shi-Ming Li, Shi-Ming Li, Ningli Wang, Ningli Wang   +14 more
openaire   +3 more sources

Effects of Local Myopic Defocus on Refractive Development in Monkeys [PDF]

Optometry and Vision Science, 2013
ABSTRACT Purpose Visual signals that produce myopia are mediated by local, regionally selective mechanisms. However, little is known about spatial integration for signals that slow eye growth. The purpose of this study was to determine whether the effects of myopic defocus are integrated in a ...
Earl L, Smith, Li-Fang, Hung, Juan, Huang, Baskar, Arumugam   +3 more
openaire   +2 more sources

Rational filter design for depth from defocus [PDF]

, 2012
The paper describes a new, simple procedure to determine the rational filters that are used in the depth from defocus (DfD) procedure previously researched by Watanabe and Nayar [4].
Joseph Raj, Alex Noel, Staunton, Richard C., Richard C. Staunton, Alex Noel Joseph Raj   +3 more
core   +1 more source

Potency of Myopic Defocus in Spectacle Lens Compensation

Investigative Opthalmology & Visual Science, 2003
Previous studies have shown that chick eyes compensate for positive or negative lenses worn for brief periods if the chicks are in darkness the remainder of the time. This study was undertaken to determine whether chicks can compensate for brief periods of lens wear if given unrestricted vision the remainder of the time.
Xiaoying, Zhu, Jonathan A, Winawer, Josh, Wallman   +2 more
openaire   +2 more sources

Relative peripheral defocus and myopic progression in children [PDF]

Graefe's Archive for Clinical and Experimental Ophthalmology, 2013
Dear Editor, Yamaguchi and colleagues [1] investigated peripheral optical quality and determined its relationship with axial elongation and myopic progression in children. On the basis that a “progressing group” of seven children had more initial hyperopic relative peripheral defocus than a “non-progressing” group of 22 children, despite both groups ...
openaire   +2 more sources