Diabetic eye screening in the UK: who the NHS invites and what happens at the appointment

Diabetes can quietly damage the tiny blood vessels of the retina — the light-sensitive layer at the back of the eye. This is called diabetic retinopathy, and it is dangerous because it is not felt until late, and advanced cases can cause sight loss. To catch changes early, the NHS invites people with diabetes for free screening — a special eye check. Here is how it works in England.

Who is invited?

Everyone with diabetes aged 12 and over. After diagnosis a letter comes, then you are invited regularly — usually yearly, or every two years after two clear results in a row. It is a separate check and does not replace a normal visit to the optician for glasses. Women with diabetes of pregnancy (gestational diabetes) are not invited to this programme, as they are monitored separately.

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What is diabetic retinopathy?

It is retinal damage caused by diabetes. Early on you notice nothing, so regular checks are the only way to catch it in time. Found early, it can be monitored or treated before it threatens sight. That is the point of screening: it looks for the problem before symptoms appear.

What happens at the appointment?

It takes about 30 minutes. You read letters on a chart. Then drops widen your pupils — these blur your vision for a few hours, so you must not drive after the appointment that day; plan your way home in advance. You then look into a camera that takes photos of the back of your eyes. It is painless.

When do results come?

Results usually arrive within 3 weeks. There are three outcomes: no retinopathy; mild "background" changes that are simply monitored; or changes needing a specialist, when you are referred to an eye doctor. A referral does not mean you are losing your sight — most often it is a chance to act in time.

Can you opt out?

Yes, you can ask not to be invited for up to 3 years. But think carefully: retinopathy develops silently, and regular screening is the most reliable way to protect sight with diabetes. If you change your mind, you can rejoin at any time.

What if no letter arrives?

If you have diabetes, are over 12, and have not been invited for a long time, contact your GP surgery or local screening service to check you are on the list. The check is free, takes half an hour once a year or two, and genuinely helps catch a disease you otherwise would not feel.