Comparison of Retinal Sensitivities Measured at Different Background Luminance Levels with Microperimeter MP-3

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  • 眼底直視下微小視野計(MP-3)の異なる背景輝度を用いた計測結果の比較

Abstract

<p>[Purpose] Microperimeter MP-3 (NIDEK) is a device that measures retinal sensitivity under direct fundus observation with the option of two background luminance levels of 31.4 asb and 4 asb. This time, we conducted sensitivity measurement of the macula under light adaptation using both background luminance levels. </p><p>[Subjects and Methods] Subjects were 4 eyes of 4 healthy participants (age, 21-25 years) who had no ocular diseases except for refractive errors. Using the MP-3, retinal sensitivity was measured during light adaptation under the following conditions: background luminance levels of 31.4 asb and 4 asb, a stimulus size of Goldmann size III, and a stimulus duration of 0.2 seconds. Measurement points were set at the center (1 point), 5° (6 points), and 10° (12 points) of the visual field. </p><p>[Results] The average retinal sensitivities for all the measurement points at the background luminance levels of 31.4 asb and 4 asb were 30.3 ± 2.0 dB and 25.3 ± 1.7 dB, respectively; showing a significant difference (Wilcoxon signed rank sum test, P < 0.001). The average sensitivities for the three measurement points at the level of 31.4 asb were 33.0 dB (0°), 31.2 dB (5°), and 29.6 dB (10°) with the highest sensitivity observed at the center of the visual field. The average sensitivities at the level of 4 asb were 25.5 dB (0°), 26.0 dB (5°), and 24.9 dB (10°). As compared to the sensitivities measured at the level of 31.4 asb, the sensitivities measured at the level of 4 asb appeared to vary less within the central 10° and the sensitivity at the fovea (0°) was 7.5 dB lower than that at the level of 31.4 asb.</p><p>[Conclusions] We measured retinal sensitivity in healthy subjects using the MP-3 with two background luminance levels. The results obtained at the levels of 31.4 asb and 4 asb appeared to resemble results by photopic perimetry and mesopic perimetry, respectively. Clinically, it is necessary to consider the difference in the background luminance level when comparing the test results.</p>

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