Sussex Vision Lab, School of Psychology, University of Sussex, Falmer, UK.
Sussex Baby Lab and Sussex Colour Group, School of Psychology, University of Sussex, Falmer, UK.
Vision Res. 2024 May;218:108390. doi: 10.1016/j.visres.2024.108390. Epub 2024 Mar 25.
Manufacturers of notch filter-based aids for color vision claim that their products can enhance color perception for people with anomalous trichromacy, a form of color vision deficiency (CVD). Anecdotal reports imply that people with CVD can have radically enhanced color vision when using the filters. However, existing empirical research largely focussed on the effect of notch filters on performance on diagnostic tests for CVD has not found that they have any substantial effect. Informed by a model of anomalous trichromatic color vision, we selected stimuli predicted to reveal the effects of EnChroma filters. Using these stimuli, we tested the ability of EnChroma filters to enhance color vision for 10 deuteranomalous trichromats in three experiments: 1. asymmetric color matching between test and control filter conditions, 2. color discrimination measured using four alternative forced-choice, and 3. color appearance measured using dissimilarity ratings to reconstruct subjective color spaces using multidimensional scaling. To investigate potential effects of long-term adaptation or perceptual learning, participants completed all three experiments at two time points, on first exposure to the filters, and after a week of regular use. We found a significant effect of the filters on color matches in the direction predicted by the model at both time points, implying that the filters can enhance the anomalous trichromatic color gamut. However, we found minimal effect of the filters on color discrimination at threshold. We found a significant effect of the filters in enhancing the appearance of colors along the red-green axis at the first time point, and a trend in the same direction at the second time point. Our results provide the first quantitative experimental evidence that notch filters can enhance color perception for anomalous trichromats.
制造商声称，基于陷波滤波器的助视器可以增强色觉异常的三色色觉患者的色彩感知能力，这是一种色觉缺陷（CVD）。传闻报告表明，使用这些滤波器时，CVD 患者的色彩感知能力可以得到极大地增强。然而，现有的实证研究主要集中在陷波滤波器对 CVD 诊断测试性能的影响上，并没有发现它们有任何实质性的影响。受异常三色性色觉模型的启发，我们选择了预测能揭示 EnChroma 滤波器效果的刺激。使用这些刺激，我们在三个实验中测试了 EnChroma 滤波器增强 10 名绿色弱三色色觉患者色觉的能力：1. 在测试和对照滤波器条件下进行不对称颜色匹配，2. 使用四个替代的强制选择测量颜色辨别力，3. 使用相似性评分测量颜色外观，使用多维缩放重建主观颜色空间。为了研究长期适应或感知学习的潜在影响，参与者在第一次接触滤波器时和一周的定期使用后，分两次完成了所有三个实验。我们发现，在两个时间点，滤波器对模型预测的颜色匹配都有显著的影响，这意味着滤波器可以增强异常三色的色域。然而，我们发现滤波器对色觉阈值的辨别力影响很小。我们发现，在第一个时间点，滤波器对红色-绿色轴上颜色的外观有显著的增强效果，第二个时间点也有相同的趋势。我们的研究结果提供了第一个定量实验证据，证明了陷波滤波器可以增强异常三色觉患者的色觉感知能力。
