Chromagen lenses, in the form of soft contact lenses or sunglasses, can be used very effectively to ‘cure’ colour blindness. The prescription will match one of the 9 coloured filters, in a variety of depths, to one or both eyes depending on the severity of the colour deficiency. The filter uses a tint over the black pupil of the eye allowing a specific wavelength of light through which produces a dramatic improvement in colour perception. Back