Yes, the eyes of replicants can glow strangely under lights. It's the case of Rachel when there is a TV screen shining in front of her when she walks toward Deckard who is cleaning his mouth after a fight with Leo during this scene:
Then, her eyes remind the ones of the owl which will be witness of Dr Tyrell's death. The owl symbolizes Athena, goddess of wisdom, for some people.
There's some tricks used to make the eyes glow. In Blade Runner, it is screens. In the Avengers, it was mirrors, for example in the episode "From Venus with love":
http://theavengers.online.fr/guide_epis ... _venus.htm. I remember that the eyes of Diana Rigg was particularly glowing because of it, and it has been also used to create the illusion of a UFO flying in the air, in the same episode. I've got a video extract here:
http://www.youtube.com/watch?v=TBjrUZq_LKE
It's more practical on brown eyes than on blue eyes, because of the contrast appearing while all looks clear on the blue ones.
Rachel