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The Use of Different-Sized Stimuli in Automated Perimetry

1986; Elsevier BV; Volume: 101; Issue: 6 Linguagem: Inglês

10.1016/0002-9394(86)90775-0

1879-1891

Jacob T. Wilensky, Joseph R. Mermelstein, Helene G. Siegel,

Ocular and Laser Science Research

Eighteen patients with glaucoma who failed to respond (0 dB) to maximum intensity (1,000 apostilbs) No. 3 (4 mm2) stimuli during threshold static perimetry performed with an Octopus automated perimeter were retested using the same test program with No. 5 (64 mm2) stimuli. All responded to the larger stimulus at the 5-dB (315 apostilbs) level or higher in at least three previously undetected locations. Ten of the 18 patients responded in at least 80% of the locations they were unable to detect with smaller stimulus. After four patients were tested twice with the No. 5 stimulus the improvement in response was confirmed. The use of the larger-sized stimulus permitted us to measure visual function in areas that had been considered absolute scotomas with the standard-sized stimulus. In this way, we can monitor changes that may occur in these areas in the future.