You’re right, several of them would be perfectly relevant in this case, but I was specifically thinking of an episode where they put electric contact lenses in soldiers and made them think they were fighting monstrous creatures rather than other people.

When the protagonist of the episode realized that and refused to fight any more, he found that the contacts were not removable by the user. His superiors put horrific displays on his lenses. Because of their nature, he couldn’t escape even by closing his eyes. Eventually he agreed to behave so as not be forced to see such horrible things.