## 1 Introduction
### The Role of Color in the Context of Legibility  
In recent years, our surroundings have become increasingly invasive and stimulating. With so much information every day, people must carefully choose what to focus on. Each year, we are exposed to more content, which diminishes our ability to concentrate. One key strategy for capturing visual attention is through the effective use of color [15].  
The color combinations chosen for text and background often play a main role in shaping content perception and enhancing its legibility. Specifically, color has been recognized as an important element that can significantly influence consumer decisions, enhancing brand differentiation, competitive advantage, loyalty, sales, and the duration of store visits [16]. Color also has the power to increase readers' willingness to engage, improve decision-making, enhance information retention and recall, extend attention span, and elevate sales potential [17].  
While previous research [2; 18] has established that contrast influences text legibility, it raises the question of whether color itself has a similar effect. Key color properties--hue, brightness, and chroma--are critical considerations when selecting colors for text and background [19]. In their study, [PERSON] and [PERSON] [20] indicated that color may influence legibility, particularly for individuals with low vision. Under daylight conditions, reading speeds for people with normal vision were independent of wavelength, except for characters near the acuity limit. The impact of wavelength on reading performance is significant only in certain instances. On these occasions, performance often declines with red or blue hues, while it is nearly optimal with green or gray.  
Further, [PERSON] et al. [21] explored how different color combinations for the target and background, as well as exposure duration, impact the icons' legibility on a display terminal. The study assessed the following two independent factors: the color combination of icons and the duration of stimulus exposure. The color combinations were categorized into the following three types: high preference, low preference, and achromatic.  
Results showed that high-preference color combinations improved icon legibility compared to low-preference combinations. Meanwhile, [PERSON] et al. [22] concluded in their study that it is still unknown how and to what extent the color difference between the stimulus and its surrounding background affects icon visual search. As noted by [PERSON] et al. (as referenced in [23]), the effect of color combination on human response is especially evident when colors are fully saturated and the difference between their wavelengths exceeds the viewer's focus depth. The evaluation of the accommodative response and changes in pupil dynamics during the reading of texts with diverse text-background color pairings was the focus of the study by [PERSON] and other authors [23]. The blue-red color combination induced an increased accommodative response. As expected, the yellow-white text-background color combination resulted in low subjective legibility ratings. However, altering the text and background color did not result in any statistically significant change in reading speed. Given the inconsistencies in the prior research, our study aims to explore the effect of color on legibility within specific chromatic pairings.