| Sumario: | Background: Several studies have investigated how patients with red/green color vision deficiency perform on clinical color vision tests using multinotch filters, most finding no differences. In this study, we investigated fine hue discrimination with multi-notch filters in depth. Methods: Subjects (n = 24) with congenital red/green color vision deficiency completed two separate visits. At the first visit, the Farnsworth-Munsell 100-Hue test was performed with and without the EnChroma multi-notch filter. Subjects then logged at least 10 hours of wear time before returning for a second visit, where the test was repeated with the filter. The total error score of the Farnsworth-Munsell 100-Hue test was the primary outcome measure, and partial error scores were used as secondary outcome measures. Repeated measures ANOVA with post-hoc Tukey testing was used to analyze the total error score of the test. Results: The mean ± SD total error scores were 117.07 ± 12.43, 114.79 ± 11.87, and 96.28 ± 9.90 for visit 1 with no filter, visit 1 with filter, and visit 2 with filter, respectively. Scores were significantly lower (i.e., better) at visit 2 compared to visit 1 with no filter (p = 0.007) and visit 1 with filter (p = 0.017). Additionally, two out of four partial error scores had significant improvements, and these were centered around the short wavelength notch of the filter. Conclusions: Improvements in hue discrimination may be more observable in specific areas of the color circle, as well as with a longer adaptation period when using EnChroma lenses. Such improvements may be missed with shorter adaptation times as used in most prior studies.
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