research showed that EnChroma glasses did not reveal any improvement in the Ishihara test and Farnsworth–Munsell 100 hue test. In 2020, a UC Davis Health Eye Center study, conducted in collaboration with France’s INSERM Stem Cell and Brain Research Institute, found that EnChroma lenses enhanced color vision for those with the most common types of red-green color vision deficiency. The study also found that the color enhancing effect persisted even after taking off the glasses. References External links Official website Lenses Color vision Optical filters