ABSTRACT

Background: Ametropia, a common refractive error that affects visual acuity and may influence contrast sensitivity and stereopsis.  Objective: This study investigates the effects of tinted lenses on contrast sensitivity and stereopsis among individuals with varying refractive errors. Methods: Seventy healthy adults participated in this study. Refractive error distribution included mild hyperopia (40%), moderate myopia (27.1%), mild myopia (27.1%), and high myopia (5.7%). Contrast sensitivity and stereopsis were assessed under aided conditions and with 50% brown, green, yellow, red, and blue tints using the Pelli–Robson chart and Frisby stereotest, respectively. Data were analyzed using Friedman’s ANOVA and the Kruskal-Wallis test, with post-hoc pairwise comparisons. Results: Stereopsis performance varied significantly across tint conditions (χ²(5) = 13.54, p = .019), though post-hoc tests revealed no significant pairwise differences after Bonferroni correction. Moderate myopia showed the highest unaided stereopsis threshold (M = 121, SD = 94), which improved with optical aid (M = 61, SD = 26). Contrast sensitivity differed significantly across tint conditions (χ²(5) = 17.97, p = .003), with the highest values recorded under aided conditions (M = 2.24, SD = 0.05) and the lowest with the green tint (M = 2.20, SD = 0.18). High myopia was associated with the greatest reduction in contrast sensitivity, particularly in aided conditions. Conclusion: Tinted lenses influence both contrast sensitivity and stereopsis, with yellow tints providing the highest contrast sensitivity. However, most tint-related differences in stereopsis and contrast sensitivity did not reach significance in post-hoc comparisons. These findings suggest that while tints may alter visual function, their clinical impact remains limited. Further research with larger samples is needed to validate these trends.

Keywords: Tinted Lenses, Contrast Sensitivity, Stereopsis, Refractive Errors, Myopia, Hyperopia, Visual Perception.