Abstract
Purpose :
To explore the impact of a color adaptation mechanism, designed to mitigate the discrepancy in color temperature between ambient light and electronic display screens, on the visual functions and key ocular parameters consequent to habitual electronic screen exposure.
Methods :
The study involved 24 participants aged 20-30 years (11 males, 13 females; average age 25±2.45 years), all with post-correction visual acuity above 0.0logMAR. It employed the von Kries color adaptation model to dynamically adjust the D65 white point according to varying color temperatures, informed by psychophysical data. This approach aimed to reduce perceptual discrepancies between video display terminals (VDT) and ambient lighting. The effects of color adaptation (On/Off) were assessed on tasks like text reading and video watching, focusing on metrics such as reading speed, efficiency, visual fatigue, blink frequency, and ocular fundus blood flow changes.
Results :
In the On mode, significant enhancements were observed in post-test reading speed (t=-2.410, P=0.016) and efficiency (Z=-2.83, P=0.005), with no notable changes in the Off mode. Reading accuracy was consistent in both modes (Off: Z=-0.59, P=0.557; On: t=-1.65, P=0.113). Visual fatigue levels remained stable in the On mode (Z=-1.45, P=0.146) but increased significantly in the Off mode (Z=-2.501, P=0.012). Blink frequency was consistent in the On mode but increased in the Off mode (Z=-2.61, P=0.009). An increase in choroidal thickness beneath the fovea was noted in the On mode compared to baseline and Off mode. No significant variations were observed in vessel density in either eye (right eye: F=0.02, P=0.984; left eye: F=0.33, P=0.719). Other visual parameters, including spherical equivalent, near point of convergence, and phoria, showed minimal differences between the modes. However, an improvement in near point lateral phoria and increased accommodation sensitivity (t=-2.64, P=0.015) were noted in the On mode, indicating improved adaptability and visual quality. Both distance exophoria and esophoria fusion amplitudes enhanced in both modes, suggesting augmented visual function.
Conclusions :
The color adaptation mechanism significantly enhanced reading performance and reduced visual fatigue in young adults using display devices. It positively influenced ocular choroidal blood flow and key visual functions, potentially providing a physiological basis to alleviate visual fatigue.
This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.