Unless the injury is to the eye itself then the eyes wouldn't be affected.

I lost most of my sight due to brain damage from a stroke which killed most of my visual cortex. My eyes are just as healthy as they were before the brain damage.

Your characters eyes would look just like anyone else's.

I'm blind due to a head injury and my eyes look completely normal. The only visible injury is a tiny bit of scarring on my head almost all of which is under my hair anyway, so the only outward sign is this here white stick that I tend to carry around. Well, okay, if you get the right medical instrument and look inside my eyes with it you can see the damage if you're a trained eye doctor and know what you are looking for. If I'm honest I haven't found that's a very common thing for people to do at parties, though.

If you really want to get this guy right, one of the things you could have him do is to complain about people assuming he's not blind because he doesn't look blind. I could see fine until I was 19 so I have normal body language, I care what I look like, I like to dress decently well and stay in shape. I won't make eye contact with you because I just can't, but if it's a nice day and I'm wearing my oakleys, and if I don't have the cane out, it is not very obvious.

This stuff tends to change depending how early people lose their sight. I was an adult (just about). I have spoken to people who were even a few years younger than I was and their attitudes vary, but in general it is probably safest to assume the guy is normal in all respects unless there's a definite reason he isn't. You'll certainly annoy less people if you work on that basis.

Generally speaking, the white eyes would be an injury to the eye. If the cause of vision loss was to the brain or optic nerve, the eyes would be fine.

That being said, you only specified head injury. I had a coworker who lost his vision when he was younger in a car accident, because his face went through the windshield. So something like that can cause trauma to the eyes as well as brain.

I think that, before you submit whatever you're writing for publication, you should show it to blind people who can tell you if your portrayal of blindness is accurate. There's an increasing emphasis on giving authentic descriptions of minorities, and your seemingly limited knowledge of blindness makes me concerned about what other stereotypes you believe about blind people. I'd be happy to read through drafts and give you comments about blindness.

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Hey, it depends. If they character was born with a specific condition or was victim to direct injury to the eye then possibly. Although it’s a harmful stereotype about the blind, its good to ask questions and now you know. Asking is better then assuming.