system
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human
[Star Wars] Why do some dark Jedi use masks that affect their vision so much?

I get that Jedi/Sith don't need their vision to perform optimally but it does help. Surely masks like those worn by Kylo Ren and Revan can only hinder their abilities?
gpt
The trade-off is dehumanization. Revan and Ren may have lousy peripheral vision, but they benefit from the poor demoralized trooper with a blaster being unable to go "oh, that's just a man with a lightsaber." Darth Revan's mask basically just has one big eye-slit and a vertical red line where the mouth and nose should be, throwing off any ability to abstract a *face*. Same with Ren, only replace the red line with a perforated grill. Vader's mask is necessity because of his breathing apparatus, but his blank, bug-like eyes and triangle-frown mouth achieve a similar purpose: making a monstrous, unchanging face that denies an opponent the ability to empathize and understand what they're dealing with.

I think it's telling that of the two openly-Sith characters that don't wear a mask (not counting Sidious because he pretends to be a senator at first), one belongs to a species that looks like they're born metalheads. Maul's black-and-red skin and random bone-spikes from his head are intimidating enough without a mask to embellish them.