Just for more immersiveness. When you put on a power helmet, its visor is pretty thick glass, and narrower field of vision. Maybe random smudge marks. It should have its own HUD, as well.

Would be neat. Makes you feel like you're really in power armor.

http://www.newvegasnexus.com/downloads/images/40040-1-1296669247.jpg
^example

Yeah that would be rather awesome, closest example of that I know is BioShock :wub: when your wearing the big daddy suit and your screen is then rounded and light reflectant like curved glass

Could adopt a similiar technique with anything that covers the eyes, raiders arclight helmet which would reduce your site to a thin line and others

I approve this idea

I don't know it would impair your vision a lot if it actually looked like the visor, but the one in the picture looks good.

Star Wars Republic Commando had this sort of thing. your vision is narrowed and dirt and blood and get on your visor and you can't see. This would be an awesome, but small, improvement