What is wrong with my kitten?

Today, we brought home an 8 week old kitten, and he doesn't seem to be doing so well. He is a little wobbly, and he doesn't move around much. Sometimes his eyes move rapidly up and down, and his head is bobbing along with them just slightly. When we went to go pick him up, he didn't seem to be this way at all, so i'm wondering if this can all be chalked up to stress, or if maybe there is something wrong with him. I shined a flash light near his eyes, and he followed it okay. We thought maybe he was blind. He ate okay when we brought him to his bowl, and he drank too. He always tries to make sure that he's backed up into something; he doesn't stay in open space. Is this just his being unfamiliar to his surroundings? Is there something wrong with his eyes ( illness or blindness wise)? Should i take him to a vet?