Color Blind Tints:
The X-Chrom lens is a bright red or magenta colored contact lens worn monocularly which enables patients to differentiate colors by altering their luminance. Red is usually very effective for rod monochromats while magenta can be helpful in blue cone monochromats.
Bright Red - contact lens is a red contact lens worn in one eye and is used to overcome red-green color vision deficiencies.
Magenta - Blue cone monochromat patients maintain function of the blue cones. Using a red filter would inhibit the blue light. However a magenta filter made from the mixing of both red and blue dyes is very effective. The red component of the filter protects rod function while the blue portion allows the blue cones to still function.