stručni rad
This paper explores the role of contrast in user interface (UI) design, focusing on how different contrast levels impact the usability of digital products for users with varying visual abilities. The study includes a review of accessibility standards (WCAG and APCA) and a user survey with 39 participants. The research highlights key accessibility principles (i.e., perceivability, operability, understandability, and robustness) and compares how contrast is measured in WCAG versus APCA guidelines. Through case study and practical evaluation using screen variations on mobile devices with altered contrast, font weight, and size, findings show that poor contrast significantly reduces component visibility and text readability. Results confirm that APCA-compliant designs enhance the user experience by ensuring optimal contrast, especially for users with visual impairments. The study emphasizes that while contrast is the most influential factor in legibility, font size and weight are also contributing factors. The conclusions advocate for the broader implementation of evolving accessibility standards to create inclusive digital environments for all users.
accessibility; user interface design; contrast; visual impairments; inclusive design; readability
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