You hear people bitching about why no VISOR all the time.
it's a serious comment.
Then they um and err, because suddenly VISOR's ain't a blind thing, they're a black thing and it's racist to stick Tuvok in a VISOR because the possibility of some crusader getting reactionary is more fearsome than the self recrimination of writing a shitting inconsistent story.
But how about this?
Tuvok has a cat, or a puppy or a monkey?
He's constantly melding with it to use his helper pets eyes to see with.
Imagine Tuvok wearing a coat of rat-king live Tribbles?
(You can make DNA with technology available today, therefore you can clone anything without a real genetic sample.)