Hamster Losing Hair Cage

How can you tell if your hamster is blind?
My hamster does not seem to blink if wave my hand in front of it. Also fell from one level in his cage and landed the other day outside of class on the head. And I have to be able to tell if she is blind. His name is Mahina and she is 7 months old hamster Petco teddy bear. Furthermore, around one eye that has lost a little hair and redness around his eye! HELP! She's my baby!
Probably is blind, but just to make sure that you bring to the vet to get her checked out.
CHINCHILLA PINE CONE WAR!
