Color perception levels in patients with hyperopia

Abstract

AbstractPurpose Evaluation of color perception levels in different types of hyperopia.Methods 4 groups of patients: 1 (n=35) – low hyperopia; 2 (n=29) – moderate hyperopia; 3 (n=26) – high hyperopia; 4 (control, n=39) –emmetropia. The supplement ‐ Farnsworth‐Munsell 100 Hue Test (FM 100). Measures of assessing were: total error score (TES), the level of recognition of colors (LRC), color vision deficiency (CVD), the type of color deficiency (TCD). Color vision defects were studied using a special computer program for FM 100.Results Group 1: TES=67±25 (р˂0,05), LRC 16‐100 TES, CVD 41‐100 TES, TCD individual abnormalities in blue color. Group 2: TES=93±25 (р˂0,05), LRC 16 and more TES, CVD 41‐200 TES, TCD cian, blue. Group 3: TES=180±25 (р˂0,05), LRC 101 and more TES, CVD 101 and more TES, TCD cian, blue, violet. Group 4: TES=53±25 (р˂0,05), LRC 16‐100 TES, CVD no more 100 TES, TCD individual abnormalities in blue color.Conclusion We revealed correlation between stages of hyperopia and color level perception: in the 1st group LRC average, CVD slight; 2nd group: LRC average/low, CVD slight/moderate; 3rd group: LRC low, CVD moderate/severe; 4th group: LRC average, CVD none/slight. Also, hyperopic refractive errors are associated with defects of blue color. Quantitative analysis of color vision defects with FM100 provides the possibility for detecting condition of cone photoreceptor cells, which mostly damaged in the 3rd group.