Don't panic! I've had the retina examinations for 7-8 years, first at the local branch of Moorfields, now at the local clinic.
A slight bleed has been reported from the first examination - not needing any attention. The last 2 years, no such bleed has been reported. Surprisingly they have not commented on the improvement - the technician is no longer allowed to talk to the patient.
3½ years ago, as a result of debilitating muscle pains, I consulted this forum & cut down on carbs. The muscle pains went, & chronic tiredness & also the retinopathy. A further bonus has been a reduction in chronic tiredness.
As for your experience, it is surprising that a difference should show up in a short time. All you can do is maintain a healthy low carb diet (NOT the DUK 50% carb diet.) The tests are annual, & in my case, even over the several years retinopathy bleed were reported, & before I went low carb, the condition did not progress.