Results 251 to 260 of about 349,442 (310)
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Archives of Ophthalmology, 1985
To the Editor. —Visual acuity measurement is the most important single test used in ophthalmology. A large variety of visual acuity charts are available, differing in the language, choice of letters, or geometric shapes. With the development of the International Chart in 1909 and the multiple revisions by the International Council of Ophthalmology, 1 ...
A M, Mansour, J B, Walsh
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To the Editor. —Visual acuity measurement is the most important single test used in ophthalmology. A large variety of visual acuity charts are available, differing in the language, choice of letters, or geometric shapes. With the development of the International Chart in 1909 and the multiple revisions by the International Council of Ophthalmology, 1 ...
A M, Mansour, J B, Walsh
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Vision Research, 1976
Abstract A behavioural test of the cat's ability to discriminate high luminance, high contrast square-wave gratings indicates that the threshold for spatial resolution is about 8–9 c/deg. This value is higher than previous behavioural and most physiological estimates of the cat's visual acuity but is lower than the theoretical limits of resolution ...
S G, Jacobson +2 more
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Abstract A behavioural test of the cat's ability to discriminate high luminance, high contrast square-wave gratings indicates that the threshold for spatial resolution is about 8–9 c/deg. This value is higher than previous behavioural and most physiological estimates of the cat's visual acuity but is lower than the theoretical limits of resolution ...
S G, Jacobson +2 more
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Archives of Ophthalmology, 1966
Since the classical work of Wertheim1there have been many studies of peripheral visual acuity. Those published prior to 1951 were thoroughly reviewed by Low.2Data from representative investigations are shown in Fig 1. Only two studies provide any information as to the variability of normal acuity at each eccentric location.
H G, Randall, D J, Brown, L L, Sloan
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Since the classical work of Wertheim1there have been many studies of peripheral visual acuity. Those published prior to 1951 were thoroughly reviewed by Low.2Data from representative investigations are shown in Fig 1. Only two studies provide any information as to the variability of normal acuity at each eccentric location.
H G, Randall, D J, Brown, L L, Sloan
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Radiologists and visual acuity
European Radiology, 1997Visual acuity (VA) and potential risks to the radiologist's eyesight have been relatively neglected subjects in the radiological literature. This study comprises two parts, the first consisting of a questionnaire on this subject sent to a random sample of 480 practising radiologists in the United Kingdom, and the second, a spot check of the VA of ...
G, Quaghebeur +2 more
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Vision Research, 1990
Visual evoked potentials were recorded from the occipital scalp of two anaesthetized Lynx (Lynx europea) in response to alternating gratings of various spatial frequencies and contrasts. The visual acuity of the Lynx was found to be around 5-6 c/deg, i.e. very close to the visual acuity of the cat and by far inferior to human acuity.
Maffei, L., Fiorentini A, BISTI, SILVIA
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Visual evoked potentials were recorded from the occipital scalp of two anaesthetized Lynx (Lynx europea) in response to alternating gratings of various spatial frequencies and contrasts. The visual acuity of the Lynx was found to be around 5-6 c/deg, i.e. very close to the visual acuity of the cat and by far inferior to human acuity.
Maffei, L., Fiorentini A, BISTI, SILVIA
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Vision Research, 1992
We assessed the ease with which horses could learn visual discriminations and measured their resolution acuity. We trained three horses to press their noses against one of two large wooden panels to receive a small food reward. Following training on a series of two-choice discrimination tasks, resolution acuity was measured.
B, Timney, K, Keil
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We assessed the ease with which horses could learn visual discriminations and measured their resolution acuity. We trained three horses to press their noses against one of two large wooden panels to receive a small food reward. Following training on a series of two-choice discrimination tasks, resolution acuity was measured.
B, Timney, K, Keil
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ON THE VISUAL ACUITY OF THE PIGEON
Journal of the experimental analysis of behavior, 1964Several lines of evidence suggest that the pigeon is near-sighted for stimuli located in front of its beak and far-sighted for stimuli located to the sides of its head.
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Archives of Ophthalmology, 1951
PERIPHERAL visual acuity has been the subject of speculation since ancient times and in the last 100 years has been measured quantitatively by numerous investigators. The purpose of this paper is to survey the present status of knowledge in this field. A short historical sketch is followed by the presentation of quantitative data.
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PERIPHERAL visual acuity has been the subject of speculation since ancient times and in the last 100 years has been measured quantitatively by numerous investigators. The purpose of this paper is to survey the present status of knowledge in this field. A short historical sketch is followed by the presentation of quantitative data.
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Science, 1976
Grating acuity, the ability to resolve high-contrast square-wave gratings, was measured in a falcon and in humans under comparable conditions. This behavioral test of falcon acuity supports the common belief that Falconiformes have superb vision—the falcon's threshold was 160 cycles per degree, while the human thresholds were 60 cycles per degree ...
R, Fox, S W, Lehmkuhle, D H, Westendorf
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Grating acuity, the ability to resolve high-contrast square-wave gratings, was measured in a falcon and in humans under comparable conditions. This behavioral test of falcon acuity supports the common belief that Falconiformes have superb vision—the falcon's threshold was 160 cycles per degree, while the human thresholds were 60 cycles per degree ...
R, Fox, S W, Lehmkuhle, D H, Westendorf
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