Another NP here... I think the conditions listed above are considered qualifying because they're often normal variants in people (in other words, weird EKG and no problems...ever). In other words, Texasmom4's post is spot on! :)
I'm not sure how much has changed since I attended, but my husband has a wicked bad astigmatism, and he made it through just fine. He couldn't get a waiver for PQ, though...fwiw.