Assuming you've had the retinal photographic screening organised by your local Diabetic Eye Screening Programme, it sounds like you probably have "background retinopathy". This doesn't affect your sight and doesn't need treatment but you do need to make sure that you don't miss any future screenings.
Eye screening is designed to pick up significant changes before your eyesight is affected which is when treatment is most effective. If someone develops any worrying changes at screening, they would normally be referred to their local ophthalmology department who will do further tests to see if any treatment is needed (or sometimes they may be asked to come back for an earlier screening).
In short, if the Diabetic Eye Screening Programme have asked you to come back in a year, it means they haven't seen any changes they are worried about and which might need treating. However they probably advised you to work on good control of glucose, blood pressure and lipids which will minimise the chance of progression.