Chen Ai-Hong, Muhamad Nurulain
Optometry, Faculty of Health Sciences, Universiti Teknologi MARA, Cawangan Selangor, Kampus Puncak Alam, Malaysia.
J Ophthalmic Vis Res. 2022 Apr 29;17(2):217-224. doi: 10.18502/jovr.v17i2.10793. eCollection 2022 Apr-Jun.
To assess the impact of color and polarity in predicting the changes of visual resolution for different text backgrounds with increasing contrast ratios.
Text-background designs of eight contrast ratios (0.15, 0.30, 0.47, 0.52, 0.57, 0.60, 0.70, and 0.78) and two text polarities (positive; black text and negative; white text) were compared with and without the presence of background color (blue, green, orange, and red). The visual resolution was measured in logMAR using Landolt C. The rate of changes in visual resolution measurements was analyzed using linear regression as contrast ratios increased with and without background color.
Visual resolution varied significantly with and without the background color element under both polarity investigations ( 0.05). Contrast ratio accounts for 77.4% of the variation within the visual resolution measurement with a color background [F = 20.76, 0.01]. Contrast ratio accounts for 97.16% of the variation in visual resolution measurements without a color background [F = 205.63, 0.01].
As contrast decreases, color plays a more significant role than the non-color factor in the resolution of fine details in both polarities as it influences the visual resolution outcome which is reflected in the measurements in logMAR units.
评估颜色和极性对预测不同文本背景下随着对比度增加视觉分辨率变化的影响。
比较了八种对比度（0.15、0.30、0.47、0.52、0.57、0.60、0.70和0.78）以及两种文本极性（正性；黑色文本和负性；白色文本）的文本 - 背景设计，有无背景颜色（蓝色、绿色、橙色和红色）。使用Landolt C以对数最小分辨角（logMAR）测量视觉分辨率。随着对比度在有无背景颜色情况下增加，使用线性回归分析视觉分辨率测量的变化率。
在两种极性研究中，有无背景颜色元素时视觉分辨率均有显著差异（P < 0.05）。对于有颜色背景的视觉分辨率测量，对比度占变化的77.4% [F = 20.76，P < 0.01]。对于无颜色背景的视觉分辨率测量，对比度占变化的97.16% [F = 205.63，P < 0.01]。
随着对比度降低，在两种极性中颜色在精细细节分辨率方面比非颜色因素发挥更重要的作用，因为它影响视觉分辨率结果，这在以对数最小分辨角单位的测量中得以体现。
