I'm pleased for you that your Retinal scan results have come back completely clear. That's certainly good news, and something that every diabetic hopes to hear.
I would mention to you that this simple test will check your eye condition for just a few basic possible diabetic conditions either developing or being present, and in NO way is this simple test as good as having a FULL eye examination at a qualified Optition, Optomitrist or at a NHS Eye Clinic.
As a diabetic you are also entitle to a free FULL eye examination by such qualified individuals as these, and I would always reccomend that you get your eyes tested at least once every 2 years. A full eye test at the Opticions, Optomitrists or NHS Eye Clinic will check your visual acruity, peripheral vision as well as the symptoms of several other things which are not covered in the mass diabetic Retinal Screening program, such as possible Glucoma or Macular disease.
It's nothing to overly concern yourself and worry about but it's always better to say safe, and besides as a diabetic you are also entitles to a free eye examination here in the UK.. We diabetics don't get much for nothing out of the NHS but the free eye examination is well worth having.