OPTIMUM PARAMETERS FOR SHORT-WAVELENGTH AUTOMATED PERIMETRY

Purpose: To determine the optimum parameters for short-wavelength auto mated perimetry (SWAP) and to recommend these for standardization of t he procedure. Methods: We used a variety of stimulus and background co nfigurations to determine the optimum background spectral distribution and luminance, and the optimum target spectral distribution, maximum luminance, and duration. We measured threshold versus intensity curves to determine which combination provided (a) the greatest isolation of the short-wavelength sensitive mechanisms and (b) the largest dynamic range for perimetry. We also evaluated the effect of lens absorption and cataract on these two factors. Results: A broad-band yellow backgr ound at 100 candela/m(2) with a narrow-band 440-nm (27-nm half-bandwid th), 1.8 degrees diameter (Goldmann size V) stimulus presented for 200 ms was optimum at all retinal eccentricities. Specific recommendation s for how to modify existing perimeters are given. Conclusion: Agreeme nt regarding the optimum parameters for SWAP should lead to standardiz ation of the test that will facilitate comparison of results from diff erent centers. Normative data can be collected at several sites and in corporated into statistical analysis packages currently available with various perimeters. This will greatly improve the clinical utility of this test.