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• W4387491440 abstract "Abstract (200) Pupil size changes in response to ambient light levels to regulate the amount of light entering the retina. This fundamental mechanism is believed to optimize the balance between visual acuity and sensitivity for effective visual processing. While prior studies have shown that larger pupil sizes can enhance target detection performance, research on the relationship between pupil size and visual acuity is less conclusive. The effects of pupil size on visual discrimination performance appear to be variable and task-dependent. By manipulating peripheral background luminance levels and target contrast, here we examine how absolute pupil size impacts visual acuity on the most common assessment of visual acuity, the Snellen eye chart. We found that higher background luminance levels were associated with improved target discrimination and faster correct reaction times. Moreover, using linear mixed models, we demonstrated a trial-by-trial intra-individual correlation between absolute pupil size and reaction times, with smaller pupil sizes correlating with better discrimination performance. In contrast, we did not observe inter-individual correlations between absolute pupil size and discrimination performance. Together, our results demonstrate that absolute pupil size, regulated by global luminance level, plays a functional role in enhancing visual acuity on the Snellen eye chart for effective foveal visual processing." @default.
• W4387491440 created "2023-10-11" @default.
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• W4387491440 date "2023-10-10" @default.
• W4387491440 modified "2023-10-16" @default.
• W4387491440 title "Pupil size regulated by ambient light levels affects visual acuity on the Snellen eye chart" @default.
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• W4387491440 doi "https://doi.org/10.21203/rs.3.rs-3412790/v1" @default.
• W4387491440 hasPublicationYear "2023" @default.
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