The tech apparently works for 80% of color blind persons, by blocking certain wavelengths that otherwise overwhelm the color blind person's perceptions of certa

The tech apparently works for 80% of color blind persons, by blocking certain wavelengths that otherwise overwhelm the color blind person's perceptions of certain colors. Once the eyes adjust to the diminished total light transmitted by the special dark sunglasses, the admitted wavelengths allow the color blind person's eyes to perceive the previously missed colors. Simple in concept, awesome technology. About $300 a pair and are available to meet those who need prescription lenses.