I can’t comment on the Diabetic aspect of corrective laser eye surgery but I did have mine done about ten years ago before my Diabetes diagnosis. I was a bit wary of high st opticians doing it as it just seemed a bit casual for something so critical, maybe that’s just me, so I had it done at a private hospital, one of the Nuffield Health group. I received excellent care, the price included all the eye drops, there were loads (!) and several follow up appointments. My vision remains perfect! I don’t regret it for a minute.