![]() ![]() However in Europe, about 8 percent of men and 0.5 percent of women in the Caucasian population suffer from some type of congenital anomaly in the performance of some of the cones, which causes color vision deficiencies. These cones are sensitive to short wavelengths (S), medium wavelengths (M) and long wavelengths (L). Luis Gómez Robledo, professor from the UGR Department of Optics and one of the authors of this paper, says, "Normal human color vision is trichromatic thanks to a cluster of three types of photoreceptors known as cones, which are present in the retina. The second approach for evaluating the effectiveness of the glasses consisted of using the spectral transmittance of the lenses to simulate different observers, which allowed the researchers to evaluate the changes in color appearance. Additionally, they used a test based on the X-Rite Color Chart, which evaluates subjective color naming. ![]() The first strategy consisted of evaluating the color vision of the participants with and without glasses using different types of tests: the Ishihara test (recognition) and the Fansworth-Munsell test (arrangement). The researchers used two complementary strategies to evaluate the effectiveness of the glasses. This UGR research involved 48 people with color blindness, after a public call to which more than 200 volunteers responded. In an article published in Optics Express, researchers from the University of Granada (UGR) have debunked the effectiveness of these glasses for color vision deficiency (CVD), proving that the EnChroma glasses don't make color blind people's vision comparable to that of people without color blindness. One claim on the company's website (at least until October 2017) was that their glasses "are designed to improve the everyday experience of color vision." However, that claim was recently changed to a more subtle statement: "The glasses are an optical assistive device for enhancement of color discrimination in persons with color blindness they are not a cure for color blindness," it says, pointing out that "results vary depending on the type and extent of color vision deficiency per individual." In fact, on its website, EnChroma states that their glasses "alleviate red-green color blindness, enhancing colors without the compromise of color accuracy," but say that their glasses "may not work" for severe red-green deficiency. The North American manufacturer advertises an improvement in color vision for certain types of color blindness, protan and deutan, by extending the range of colors users perceive without affecting the colors that are already distinguished without glasses. ![]()
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