Eyes/Non-crusty Is there a way to tell if a piggy is blind?

I adopted 2 more boars 2 days ago and have them in quarantine right now. One of them (Einstein) is solid white with red eyes. At first glance I thought he was a lethal, and still suspect that he is. I kinda feel that he is blind. He just acts differently than the other pigs. He doesn't really run into things, but is cautious when walking, and doesn't notice me around unless he hears me or smells my hand as I reach down to pet him. He is actually pretty sweet, and lets me pet him. I haven't gotten a chance to try and look at his teeth yet. He eats pellets and veggies okay. And he drinks. He has no eye crust nor do his eyes look cloudy. He isn't sneezing. He seems perfectly healthy except for what I mentioned above. Oh, and also, he doesn't run around the cage or popcorn at all. He will walk all around the cage. Do I need to take him to the vet to confirm this? I have no experience with Lethals. I have been reading up on them on GL and here. I adopted him and his brother from a family who had had them for about 4 months and couldn't figure out " Why they haven't had babies??" So you can imagine what I saved these piggies from. I just wanted to know if anyone else has a blind pig and could offer me some guidance. I already love him, and he already comes to the side of the cage when he hears my voice .