Effects of color and background luminance on minimal legible size of dynamic Chinese characters presented on a LCD monitor for low‐vision and normally sighted users

Abstract

Abstract— The effects of velocity (3, 5, and 7 cm/sec), stimulus color (red, green, and blue), and background luminance (20–80% white, in increments of 15%) on minimal legible size of dynamic Chinese characters, were examined. Participants were divided into low‐vision, severely myopic, and normal‐vision groups. They were asked to recognize the stimulus Chinese characters, which were presented with varying velocity on a screen. Analysis showed that the minimal legible size was significantly greater for those in the low‐vision and severely myopic groups than for those in the normal‐vision group, and the minimal legible size for the low‐vision group was greater than that for the severely myopic group. The minimal legible size was significantly greater when the stimuli were green than when they were red or blue; however, no significant difference was found between green and blue stimuli or between blue and red ones. An effect was observed for background luminance: a higher ratio of white in the gray background yielded a smaller minimal legible size than did a lower ratio of white. Additionally, velocity significantly affected the minimal legible size: a velocity of 3 cm/sec resulted in lower minimal legible size than did a velocity of 7 cm/sec. Results have implications for electronic text information design or icon design for visually impaired individuals.

Colour Brightness Recognition of Extremely Severe Amblyopia Children in Indoor Environment

“…Statistically signi cant variations in the weighted score suggested that as distance increases, the recognition rate for highbrightness colors decreases, while low-brightness colors consistently receive higher scores. It is noteworthy that, distance did not produce a signi cant effect on the recognition of green [51] Furthermore, other studies have also found that the minimum discriminable size for lowbrightness backgrounds exceeds that for high-brightness backgrounds [29] , suggesting better recognition for low-brightness colors, which is consistent with our ndings. The research by Ying Li further indicated that as observation distance increases, the discriminability of colors decreases, while the perception of black and white by visually impaired individuals relatively improves [9] , providing support for our ndings.…”

“…Bin Cheng et al introduced a visual system and instructional design tailored for those with low vision and blindness in indoor environments, emphasizing the importance of standardized text spacing, graphic size, and color brightness [28] . Huang, K.-C. delved into the effects of color and background brightness on LCD screens for individuals with low vision, with experimental results underscoring the importance of electronic text information and icon design for visually impaired individuals [29] . Baker et al identi ed the shopping requirements of visually impaired individuals and proposed a color design approach [30] .…”