I hope this is a right place to ask this question. I'm writing scifi book, and looking for information whether it is possible for any element, chemical compound, radiation or something else to color the human eye lens (and or freckles) to purple.

  • $\begingroup$ You meant the iris by writing the lens? Colored lens would lead to partial blindness in chosen part of the spectrum. $\endgroup$ – BagiM Feb 12 '19 at 5:56
  • $\begingroup$ If it's for a sci-fi book, how about genetically engineered (designer baby kind of thing) humans where the humans have a genes inserted to express purple chromophores in their lens or on their skin in melanocytes? It wouldn't be awfully straightforward, but hey, if you can cause organized fibrillation of lysozyme (a protein normally found in bodily fluids), you can get purple pigment! Also, a purple lens would mean that your purple-lensed character would be impaired in seeing purple. $\endgroup$ – S Pr Feb 12 '19 at 12:25

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