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Results for “Vision Tests”

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At least 253 records · Page 14Linked to original sources
PubMed1975

Predictive validities of several clinical color vision tests for aviation signal light gun performance.

Scores on the American Optical Company (AOC) test (1965 edition), Dvorine test, Farnsworth Lantern test, Color Threshold Tester, Farnsworth-Munsell 100-Hue test, Farnsworth Panel D-15 test, and Schmidt-Haensch Anomaloscope were obtained from 137 men with color-defective vision and 128 men with normal color vision. The validity of each of these tests in predicting scores on the aviation signal light gun was assessed by using daytime and nighttime administrations of the light gun as the criteria. Two "best sets" of plates from the AOC and Dvorine tests were selected by calculating a multiple regression equation in a stepwise manner with the nighttime and then the daytime administration of the signal light gun test as the criteria. Based on a graphic presentation of the miss and false alarm rates for each test at various possible cut scores, suggestions were made regarding the use of each test and the selection of optimal pass/fail scores.

Aerospace Medicine↗
PubMed1987

Analysis of the Mark II edition of The City University Colour Vision Test.

The City University (TCU) test was administered to 50 dichromats and 56 anomalous trichromats. Certain poorly performing plates are identified from the accuracy of diagnosis compared with the Nagel anomaloscope and the number of dichromats passing the plates. Some plates are indicated as providing a more reliable diagnosis, particularly when used in combination. The performance of the plates is compared with their colorimetric properties. The desaturated plates, which were not part of the Mark I test, are shown not to provide the intended extent diagnosis.

Color Perception↗
PubMed1995

[Sensory vision tests in neuro-ophthalmology].

Contemporary views on assessment of visual function were presented. The tests feature high sensitivity and possibility of quantitative evaluation of visual abnormality.

Electroretinography↗
PubMed1991

[Vision tests for the severely handicapped].

The methods available for acuity assessment of multi-handicapped persons are limited by lack of verbal, manual and locomotor response indicators. However, eye activity itself, can provide a clue to what is seen. The results in the present study suggest that the preferential looking technique, using gratings as stimuli and eye movements as response indicators, is a useful tool for assessing the acuity of multi-handicapped people. However, acuity testing of multi-handicapped people was very time consuming, and called for many individual adaptations.

Blindness↗
PubMed1995

[The Freiburg Vision Test. Automated determination of visual acuity].

The Freiburg Visual Acuity Test is an automatic computerized procedure for self-administered measurement of visual acuity. Landolt-Cs are presented on a monitor in one of eight orientations. The subject presses one of eight buttons, which are spatially arranged according to the eight possible positions of the Landolt-C's gap. To estimate the acuity threshold, a best-PEST procedure is employed, assuming a psychometric function with a constant slope on a logarithmic acuity scale. The discreetness artifacts in computer monitors limit the presentation of small stimuli. By anti-aliasing (smoothing of contours by gray-shading), the spatial resolution was improved by a factor of four, such that the shape of Landolt-Cs with oblique gaps is adequate and visual acuities from 0.06 up to 3.6 can be tested at a distance of 5 m.

Artifacts↗