The only point I could see in wearing one would be to conceal my vallaslin. Then I'd simply be another dirty knife-ear rather than a dangerous savage knife-ear.

[Yeah she loved the very short time she spent in Orlais. Even her Warden robes didn't shield her from some of the opinions thrown her way. The fact that she didn't light anyone on fire is nothing short of a miracle.]

If it's such a strain on your eyesight it's a miracle they can even make out faces to tell who is human and who isn't.