PMID: 7335308Oct 1, 1981Paper

Automated variable contrast acuity testing

Ophthalmology
M A MainsterC L Schepens

Abstract

The results of clinical trials with a simple system for automating visual acuity measurements are presented. An inexpensive microcomputer: (1) presents acuity targets on a television screen, (2) uses patients' responses entered through a remote response box to control a staircase testing procedure, and (3) prepares a printed record of a patient's mean visual acuity and its standard deviation. The automated method: (1) offers a stable measure of visual performance, (2) provides an immediate analysis of the statistical significance of changes measured in visual acuity from one office visit to the next, and (3) gives results that are in general agreement with conventional chart testing methods when high contrast targets are used on the television screen. In addition, when medium and low contrast targets are used, the automated method provides a variable contrast acuity profile (VCAP), which describes visual performance at contrast levels that are vital to a patient's performance in daily life but not examined in conventional chart testing. VCAPs are measured clinically, and it is shown that the extent that a patient's acuity declines with decreasing contrast cannot be predicted from the patient's high contrast acuity. Automated va...Continue Reading

References

Dec 1, 1965·The Journal of Physiology·F W Campbell, D G Green
Jan 1, 1980·International Ophthalmology Clinics·I Bodis-Wollner
Sep 12, 1980·Science·R SekulerC J Owsley

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Citations

Jan 1, 1985·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·O KatsumiT Hirose
Jan 1, 1984·Vision Research·B L Lundh, S Arlinger
Dec 19, 2002·The British Journal of Ophthalmology·M A Mainster, G T Timberlake
Jul 1, 1982·Ophthalmology·M A MainsterG W Hughes
Aug 1, 1996·Ophthalmology·M L Rubin, G M Hope
Jun 1, 1983·Acta Ophthalmologica·B L Lundh, G Lennerstrand
Feb 4, 2021·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Harold E Bedell, Sop Song

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