The effect of central and peripheral luminance on visual acuity

摘要

Context: Lighting conditions significantly influence visual acuity (VA), visual function, and quality of life. Previous research highlighted a correlation between luminance and VA but left a gap in understanding the impact of surrounding luminance. This study focused on investigating the effects of both central and peripheral luminance on VA. Purpose: This study aimed to investigate the influence of both central and surrounding luminance on VA through distance VA measurements. Settings and Design: A dual-component lighting system was utilized, comprising a self-illuminated ETDRS chart and a skyLED system for consistent surrounding illumination. Two experimental setups were conducted: the first varied the central luminance (25 +/- 2-341 +/- 10 cd/m(2)), while the second maintained a constant central luminance (150 +/- 5 cd/m(2)) and varied the surrounding luminance (4 +/- 2 cd/m(2) OFF-105 +/- 10 cd/m(2) ON). Methods: Sixty-six participants with refractive errors between 0.0 D and -2.75 D were tested under various lighting conditions. Both uncorrected refractive error (URE) and corrected refractive error (CRE) eyes were evaluated. Statistical Analysis Used: Paired t-tests were used to evaluate the statistical significance of differences in VA scores. Results: Experiment 1 demonstrated a significant increase in VA scores, with mean improvements of -0.120 LogMAR for URE eyes and -0.073 LogMAR for CRE eyes as chart luminance increased from 26 cd/m(2) to 153 cd/m(2). Experiment 2 further showed a notable improvement in VA scores under varied surrounding luminance conditions, with mean improvements of - 0.118 LogMAR for URE eyes and -0.073 LogMAR for CRE eyes as luminance increased from 4 cd/m(2) to 102 cd/m(2). Conclusions: This study emphasizes the significant impact of both central and peripheral luminance on VA. The introduction of the skyLED lighting system underlines the importance of optimal lighting for visual performance.