The purpose of this study was to consider the perceived brightness change in peripheral vision affected by retinal locus and contrast (peripheral field luminance/background luminance). Using the matching method and Nakamura's fovea brightness simulation system comprehensively, we complexly calculated the contrast change from the background, which cannot reflect in matching luminance, and significant perceived brightness changes among retinal loci were obtained. The result shows that the calculated peripheral brightness value in each contrast series is proportional to the luminance logarithm. Peripheral brightness is brighter than in the fovea when the contrast is larger than one and darker than in the fovea when the contrast is smaller than one. As a result, the calculated peripheral brightness value is greatly changed by the contrast effect further away from the fovea. Peripheral brightness is more sensitive to change by the contrast effect in smaller target stimuli. However, under low luminance conditions, peripheral brightness is brighter than in the fovea independent of contrast. These results show that the calculated peripheral brightness value's change in each retinal locus is based on equal contrast.
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