I have had several bouts of laser treatment and at the time there was no requirement to register it with DVLA, but there was a need for medical determination by the Consultant opthamologist to provide the guidance on reduced vision and sensitivity for night driving, anf possible field of vision problems later on. I did declare these ops when I renewed my licence at 70 a couple of years ago. DVLA permitted me temporary driving permissions while they followed this up, and I was required to have a formal DVLA drivers sight test before I got my full renewal through, But I also had some strokes and heart attacks that they also had to consider along with the diabetes, so it did take about 6 months to get my photo ID.
I have now had triple heart bypass operation a couple of weeks ago, and am on a driving moratorium until Consultant gives go ahead, but I should be clear to drive again and do not need to inform DVLA either.
So, the laser treatment was actually small potatoes in the scheme of things, and I passed the field of vision test.