EnChroma

EnChroma lenses are specialized glasses designed to address symptoms of red-green color blindness. Studies have shown that these lenses can alter the perception of colors that were already perceived, but they do not restore normal color vision. Some claims made by the manufacturer have been subject to criticism and described as deceptive and marketing hype, because research shows that the lenses change color perception, but not in a way that improves overall color perception. Peer-reviewed studies and independent reviews conclude that the glasses "do not confer any improvement in the ... color blindness tests. Therefore, the glasses cannot improve scores in professional screening tests, contrary to what the company claims on its website." Emotional reactions in videos published by the manufacturer of people trying these glasses for the first time has been attributed to both fraud and to the honest emotional response by some people to the unexpected change in the perception of colors already visible to them.