Eye surgery won't be an issue. I know guys that have had it here. The eye test is the exact same as the US.
The only medical differences are they can ask you to repeat ANY of the original issuance exams (full blood work, pulmonary x rays, etc) Its basically what kind of mood the AAC woman is in when you go the gov't office. She looks at the paper and checks off what you need to have done.
You have to love the chaos to come down here.