Color vision deficiency (CVD), commonly referred to as color blindness, affects a significant portion of the global population, particularly among males. This narrative review synthesizes findings from peer-reviewed articles and published large-scale epidemiological studies identified through database searches using terms such as “color vision deficiency,” “color blindness,” “awareness,” and “diagnosis.” Studies were included if they addressed prevalence, awareness, diagnosis, or lived experiences of individuals with CVD. The prevalence of CVD varies by population, with red–green CVD affecting up to 8% of males and 0.5% of females of Northern European descent and lower rates reported in Asian and African populations. Although CVD is congenital in most cases, diagnosis is often delayed until school age or later due to limited routine screening, with many individuals remaining unaware of their condition until adolescence or adulthood. This delay can result in significant educational, occupational, and psychosocial challenges. This review synthesizes the current literature on the prevalence of CVD, levels of awareness, the age and process of diagnosis, and the lived experiences of individuals affected by this condition. Recommendations are provided for early detection, educational adaptations, and societal support.

This study determined the AC1 agreement values between computer-based color vision tests and the Farnworth–Munsell D-15 (F-D15) and the Holmes–Wright Type A lantern (HWA). The computer-based tests were the United States Air Force Cone Contrast Test (OCCT), Cambridge Color Test, Innova Rabin Cone Contrast, Konan–Waggoner D15 (KWC-D15), and Color Assessment and Diagnosis (CAD). Sixty-eight color-vision-defective persons participated. The KWC-D15 had the highest AC1 with the F-D15 ( A C 1 = 0.88 ). Both the CAD and OCCT had the highest values with the HWA ( A C 1 > 0.96 ). The KWC-D15 would be the best substitute for the F-D15. Either the CAD or OCCT would be appropriate substitutes for the HWA.

The W-D15 test, a computerized variant of the F-D15 test, is used to determine whether an individual with a color vision defect can safely perform color-related tasks. This study evaluated the performance of the W-D15 test using an iPad. Fifty-nine color normal and 61 color vision defect subjects participated. Participants were screened based on the Ishihara, City University Test, and Waggoner PIP24 tests. Different failure criteria of the D15 tests were considered. The pass/failure agreement between the two tests was relatively appropriate, with a κ -coefficient ≥ 0.8 , for all failure criteria. The W-D15 could be an appropriate substitute for F-D15 using an iPad.

Traditional color vision tests lack the sensitivity to detect subtle differences in individuals with normal color vision. The Konan ColorDx Cone Contrast Threshold (CCT) HD test allows the quantitative measurement of color discrimination thresholds for each cone type. This cross-sectional study established normative values for L-, M-, and S-cone contrast sensitivities and evaluated the effects of age and sex on color discrimination thresholds. Participants aged 15–79 years with normal color vision were included (n = 216; 55% female). CCTs were measured monocularly using the Konan ColorDx CCT HD test under standardized conditions, and the influences of age and sex on L-, M-, and S-cone sensitivities were evaluated. In all groups, L-cone sensitivity was the highest, followed by the M- and S-cone sensitivities. Overall contrast sensitivity was significantly higher in females than in males (mean difference = −0.041), especially for adolescents and young adults (20–24 years). Young adults outperformed middle-aged and older adults, with age-related decline most pronounced for S-cone sensitivity in those over 60. The right and left eye sensitivities did not differ. This study provides age- and sex-stratified normative data for the Konan Color Dx CCT HD test, supporting its use for clinical and occupational assessments.

This work expands on our previous comparison of the Konan–Waggoner D15 (KW-D15) and Farnsworth D15 (F-D15). Sixty subjects with normal color vision and 68 subjects with a red–green color vision defect participated in the study. The KW-D15 had good agreement with the F-D15 for both pass/fail and classification across all failure criteria. The agreement was slightly better if subjects had to pass on 2/3 trials compared with just the first trial. The KW-D15 is an adequate substitute for the F-D15, with the caveat that the KW-D15 might be slightly easier to pass than the F-D15 for deutans.