Results 331 to 340 of about 2,255,413 (373)
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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 ...
Ahmad M. Mansour, Joseph 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 ...
Ahmad M. Mansour, Joseph B. Walsh
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Nature, 1947
MOST published researches on visual acuity have assumed an unrestricted time of observation, but recent studies of the relations between intensity discrimination and acuity, and photo-chemical theories thereof, have indicated that the wandering of fixation plays an important part in the performance of the visual system.
L. C. Martin, W. Kaniowski
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MOST published researches on visual acuity have assumed an unrestricted time of observation, but recent studies of the relations between intensity discrimination and acuity, and photo-chemical theories thereof, have indicated that the wandering of fixation plays an important part in the performance of the visual system.
L. C. Martin, W. Kaniowski
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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.
Darlene J. Brown +2 more
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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.
Darlene J. Brown +2 more
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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 ...
J. Murfitt +2 more
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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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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.
Kathy Keil, Brian Timney
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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.
Kathy Keil, Brian Timney
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Vision Research, 1967
Abstract Rabbits were trained to discriminate vertical and horizontal striations. By changing the width of the white and black bars, visual acuity was studied. Four animals were studied. In three of them the finest pattern that could be discriminated was that in which the bars were seen under a 20′ visual angle.
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Abstract Rabbits were trained to discriminate vertical and horizontal striations. By changing the width of the white and black bars, visual acuity was studied. Four animals were studied. In three of them the finest pattern that could be discriminated was that in which the bars were seen under a 20′ visual angle.
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THE NEUROLOGY OF VISUAL ACUITY
Brain, 1980A series of patients with well defined lesions of various parts of the visual pathways was studied in an attempt to iluminate the neuropathophysiology of visual acuity. Acuity was found to remain normal in all cases with unilateral retrochiasmal lesions, including those of the optic tract.
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Annual Review of Entomology, 1997
▪ Abstract The acuity of compound eyes is determined by interommatidial angles, optical quality, and rhabdom dimensions. It is also affected by light levels and speed of movement. In insects, interommatidial angles vary from tens of degrees in Apterygota, to as little as 0.24° in dragonflies.
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▪ Abstract The acuity of compound eyes is determined by interommatidial angles, optical quality, and rhabdom dimensions. It is also affected by light levels and speed of movement. In insects, interommatidial angles vary from tens of degrees in Apterygota, to as little as 0.24° in dragonflies.
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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 ...
W.I. McDonald +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 ...
W.I. McDonald +2 more
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