Diabetic retinopathy is diagnosed by an eye test.
At the eye test the optometrist will examine your eyes. They may use eye drops to help to see the back of your eye. They may take a photo of the back of your eye.
If you have diabetes, you should have your eyes checked when your diabetes is first diagnosed and then at least once every 2 years.
If you experience any changes to your vision, see an optometrist or ophthalmologist as soon as you can.