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March 1993

Evaluation of Baseline-Related Suprathreshold Testing for Quick Determination of Visual Field Nonprogression

Arch Ophthalmol. 1993;111(3):365-369. doi:10.1001/archopht.1993.01090030083044

• Objective.  —To evaluate a commercially available means of baseline-related suprathreshold examination designed to detect visual field worsening.

Design.  —Patients for whom results of a baseline series of static-threshold visual field examinations were available underwent both a second static-threshold examination (full-threshold strategy; average time, 15 minutes) and a baseline-related suprathreshold examination ("fast-threshold" strategy; average time, 5 minutes).

Results.  —Most of the 1702 points examined were apparently unchanged from baseline, showing with either method only the degree of variation expected from the measurement inconsistency (short-term fluctuation). For points that did show a change, the changes shown by the two methods were correlated. Change in the field as a whole, represented by a cluster of locations showing deterioration, was evident more frequently with the standard testing strategy: 11 of 37 field examinations showed deterioration by both methods and an additional 11 examinations showed deterioration by the full-threshold method only.

Conclusions.  —Each examination method identified pointwise changes not detected by the other, the combined effect of false-positive errors (imperfect specificity) and false-negative errors (imperfect sensitivity) with each of the two methods. The findings relating to clusters could represent a better sensitivity of the full-threshold method in detecting visual field deterioration, a better specificity of the suprathreshold method, or both.