I was nearsighted, but not to that extent. So, I went to my optometrist and asked that he make a pair of glasses at 20/850, just to be sure. I wore them to my physical, barely able to see the back of the person in front of me as we went from room to room. When I got to the station that measured glasses, the medic who measured my glasses told me that I would not be drafted due to my prescription, but that I would have to see the Army opthamologist in the next room. I noticed there was equipment to do a complete eye exam and again panicked. However, the doctor simply shined a light in my eyes (presumably to see that I was really nearsighted — the light would not focus on my retina), then signed a form and said I would be classified I-Y (draftable only in a declared war). Sure enough, a few days later I received a new draft classification card with I-Y. All I-Y classifications were later converted to IV-F by Nixon before the ’72 election.
As it turned out, my lottery number a few months later was high, but I probably would have been drafted before the lottery happened, as I lived in West L.A. which was full of students who were otherwise exempt. I wonder if anyone else tried this. I kept the glasses for many years, then finally threw them out — with my draft card.