Yes I did have a PPL and about 10 years/ 130 hours ish when I was examined. I don't know how much of a factor experience is when they are deciding on a deviation - I was certainly asked about what I flew, how often, any probs etc.
I think the medics are trying to establish what 'risk' there is in particular cases. Obviously, if you have been flying about happily for a while with no ill effects, that's a good indication (though not fool-proof of course) that your eyesight is acceptable. I don't think they would be as prescriptive as saying you need a PPL in order to get the deviation, but I reckon they might be a bit more wary and ask some more questions...
Best of luck anyway.