Question: As Deckard is giving Rachel the VK test, her eyes have the golden glow to them when he asks the second question about the boy with the butterfly jars. Why does he not catch right then that she's a replicant just by seeing her eyes glow?
zendaddy621
10th Sep 2013
Blade Runner (1982)
Chosen answer: Deckard already knew that Rachel was a replicant before starting the VK test (Tyrell told him); Rachel was a new model of replicant who could supposedly beat the VK test. Deckard just wanted to see if this was true.
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Answer: The glowing eyes phenomenon was actually an effect added by Scott, who probably thought it would look cool. Obviously he didn't think it through because it would make detecting replicants very easy indeed, and would make the VK test redundant. I believe he has said in interviews that it is intended as a cinematic effect, and is not intended to be a characteristic of the actual characters. This is one of several mistakes that the director made in the film, and which have subsequently passed into the folklore of Blade Runner.