The fictitious Voight-Kampff test is based on a real machine based on terrible pseudo-science that was used in the 1960s to allegedly detect homosexuals working in Canadian public service so they could be purged. The line from the movie where Rachel asks if Deckard is trying to determine whether she is a replicant or a lesbian may be an allusion to the fruit machine. One of its features was measuring eye dilation, just as depicted in the movie:

https://en.wikipedia.org/wiki/Fruit_machine_(homosexuality_t...

The stakes for men subjected to the test were the loss of their livelihoods, public shaming, and ostracism. So... Blade Runner was not just predicting the future, it was describing the world Philip K. Dick lived in when he wrote "Do Androids Dream of Electric Sheep" in the late 1960s.