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About 10,000 papers for “Visual acuity”

Visual Acuity

National Cancer Institute · Definitions · 2020

Cited by 0Open access

Visual Acuity

Judith E. Goldstein, Xinxing Guo, Michael V. Boland et al. · Ophthalmology Science · 2022

Electronic health record VA data quality and usability vary across documented VA measures, observations, and eyecare subspecialty. We proposed a checklist of considerations and recommendations for planning, extracting, analyzing, and reporting retrospective study outcomes using EHR VA data. These are important first steps to standardize analyses enabling comparative research.

Cited by 9Open access

Visual Acuity

Patrick J. Mulholland, Nilpa Shah, Michael D. Crossland et al. · Elsevier eBooks · 2024

Cited by 0

Visual acuity

Lawrence Weiskrantz · 2009

Abstract In our original report (Weiskrantz et al., 1974), we used an Ives apparatus that generates a sine-wave grating when light is passed through a pair of diffraction gratings (Moiré fringes; the apparatus is the same as that described more fully in Weiskrantz and Cowey 1963). Only one position in the scotoma was tested originally. The grating was visible in a circular aperture, 6° 39’ diameter, which was placed so that its centre was either 8° 48’ to the left or right of the fixation point (53 cm from the subject), depending on which visual half-field was being tested. Stimuli were presented singly, and D.B. was asked to report ‘lines’ or ‘no lines’, and the spatial frequency varied randomly from trial to trial so that a threshold determination could be made. Even though D.B. reported not only seeing no lines at all, but not even the brightly lit aperture, his performance varied systematically with the spatial frequency, and an acuity threshold could be determined. The results are summarized in Fig. 5.10 in Part III, where it can be seen that his minimal separable acuity in the impaired field at this position was a creditable 15.8 cycles/degree, as compared with 20 cycles/degree in the mirror symmetric region of the intact right half-field.

Cited by 0

Visual acuity /

McFadden, Hugh B., Optometric Extension Program Foundation. · The Journal of the Abraham Lincoln Association

Cited by 0Open access

VISUAL ACUITY

Sir Lister, Brit, R Davenport et al. · British Journal of Ophthalmology · 1946

This was noted in 192 of the total number of cases recorded, and -in 71 cases I have been sunable\ to ascertain the vision.

Cited by 0Open access

VISUAL ACUITY

&NA; · Optometry and Vision Science · 1933

Cited by 0

Visual acuity

L. Weiskrantz · Oxford University Press eBooks · 1990

D. B. was randomly presented with either a grating of a given spatial frequency and constant contrast, or a plain stimulus matched in flux (actually a stimulus with ultra-high spatial frequency to guarantee a flux match) and asked to respond, ‘lines’ or ‘no lines’. The spatial frequency was changed in groups of thirty trials and the cut-off spatial frequency determined for 75% performance. Two different apparatus were used for presenting sine-wave gratings: the Moiré fringes generated by light passing though a pair of diffraction gratings, or non-luminous non-projected photographic prints mounted on cardboard. In his blind field, acuity actually improved with increasing eccentricity out to about 30°. His spatial frequency acuity compared to his good field was reduced by about 2 octaves, a result similar to that reported by the Pasiks for the monkey without striate cortex. D. B. never reported any experience of the gratings and said he was ‘just guessing’.

Cited by 0

Visual Acuity

Mary Jo Webb · Occupational Health Nursing · 1981

Cited by 0

Visual Acuity

Phil Fontanarosa, Stacy Christiansen · Oxford University Press eBooks · 2009

Cited by 0

Visual Acuity

Journal of Cataract & Refractive Surgery · 2005

Cited by 1