The physical isn't that tough. A nurse looks in one ear while the doctor looks in the other ear, if they can see each other you pass......
They can't legally disqualify anyone for medical issues. That's a violation of the Americans With Disabilities Act.
You revived a thread that's been dead for 3 years to post that ? You're wrong you know . There's thousands of diabetics and others that will confirm that . Isn't being blind a medical issue ? Seen any blind truck drivers lately ?