Results 271 to 280 of about 5,294,886 (309)

Visualizing transcendental functions

Computing in Science & Engineering, 2000
Scientists and engineers often need to compute mathematical functions that depend in a complicated way on their parameters. Such functions-especially those whose analytical properties researchers have studied extensively-are called transcendental functions or special functions. There are three important reasons for visualizing such functions: to better
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VISUAL FUNCTION IN DYSLEXIA

American journal of optometry and archives of American Academy of Optometry, 1968
Abstract The problem of the seriously retarded reader is examined to determine the role of vision. The most obvious visual factors, such as acuity and refractive error, do not seem related to the problem.
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Functional visual streams

Current Biology, 1992
The idea that visual signals relayed by the parvocellular and magnocellular subdivisions of the lateral geniculate nucleus remain segregated in the cerebral cortex has attracted considerable attention. It has been proposed that parvocellular contributions dominate in the temporal visual cortex, and that magnocellular contributions dominate in the ...
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The Importance of the Phase Transfer Function to Visual Function and Visual Quality Metrics

Journal of Refractive Surgery, 2004
<p>ABSTRACT</p><p>PURPOSE: To propose a vision quality metric that directly incorporates the phase transfer function.</p><p>METHODS: The process of retinal image formation from the pupil to the retina is presented to identify possible domains for calculating vision quality metrics.
Edwin J, Sarver, Raymond A, Applegate
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Functional Visual Loss in Children

Ophthalmology, 1986
Twenty-three children (16 girls, 7 boys, aged 6-17 years) who presented with the specific complaint of blurred vision were diagnosed as having functional visual loss. Symptoms were intermittent in seven children. Associated signs and symptoms were common and included headaches, visual field loss, diplopia, micropsia, voluntary nystagmus, and spasm of ...
R A, Catalono, J W, Simon, G B, Krohel, P N, Rosenberg   +3 more
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The Visual Function of the Vitamins A

1961
Publisher Summary The retinas of most vertebrate eyes possess two kinds of light receptor: rods, for vision in dim light, and cones, for vision in bright light and for color vision. Each of these organs contains a photosensitive pigment, which bleaches on exposure to light. Some aspect of this process leads to a nervous excitation, which, transmitted
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Modification of visual function by early visual experience

Bulletin der Schweizerischen Akademie der Medizinischen Wissenschaften, 1976
Physiological experiments, involving recording from the visual cortex in young kittens and monkeys, have given new insight into human developmental disorders. In the visual cortex of normal cats and monkeys most neurones are selectively sensitive to the orientation of moving edges and they receive very similar signals from both eyes. Even in very young
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Visual function thresholds in children

Current Eye Research, 2000
The aim of the present study was to establish a range of values for individual visual function measurements in Primary 1 schoolchildren.93 visually normal children with a mean age of 5.4 +/- 0.3 years were recruited with parental consent. Measures of visual acuity obtained included 1) High Contrast (CAT) 2) Low Contrast (LC) 3) Single Letter (SLA) and ...
A J, Simmers, L S, Gray, B, Winn
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Photophysiological functions of visual pigments

Advances in Biophysics, 1984
In order to gain a fundamental understanding of functions of a visual pigment, i.e., photoreception and phototransduction, it is essential to elucidate the molecular structure of visual pigment, its photochemical behavior and connection of the pigment to the molecular physiological amplification mechanism for excitation of a visual cell. A rhodopsin, a
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Mid-range visual functions in relation to higher-order visual functions after stroke

Journal of Clinical and Experimental Neuropsychology, 2022
Yair Pinto, Edward H.F. de Haan, Nils S van den Berg   +2 more
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