Researchers from the University of Birmingham have developed a contact lens that can help correct certain kinds of color blindness, thanks to a safe, low cost dye.
Color is perceived by light hitting clusters of cells called cones in the back of the eye. Different cones pick up different wavelengths of light, and working together they let us see the entire spectrum of colors. When these cones don’t work properly, usually for genetic reasons, they affect a person’s ability to sense certain colors, resulting in what we know as color blindness or color vision deficiency (CVD), as it’s technically known.