These intraocular lenses use the exact same chromophore as a young human crystalline lens (3-HydroxyKynurenine), having the same light spectrum while still allowing some beneﬁcial violet rays to enter. EyeKon’s Natural Yellow lens is superior to other yellow IOL material because it ﬁlters out harmful violet rays protecting the retina without blocking needed blue light still allowing some beneﬁcial violet rays to enter. Providing complete natural protection without losing contrast sensitivity or color perception. Recent independent investigations have shown that current blue blocking IOLs cause a loss in contrast sensitivity and color perception. There is nothing more natural than using the same chromophore that nature intended when the natural lens must be replaced.