Free eye test if you have diabetes
A diabetes diagnosis (Type 1 or Type 2) gives you two separate NHS entitlements: free NHS sight tests at any high street optician, funded at the interval your optometrist recommends, plus retinal photography screening through the NHS Diabetic Eye Screening Programme. Both are free. Both are useful, and they look for different things.
Two NHS programmes, side by side
The two services are commonly confused because both are free and both involve looking at your eyes. They are run by different parts of the NHS and check different things.
| Aspect | NHS sight test | NHS DESP screening |
|---|---|---|
| Run by | High street opticians | Regional NHS DESP centres |
| You book | Yourself, when due (or sooner if your vision changes) | By invitation letter |
| Location | Optometry practice | Hospital, clinic, mobile unit, or your GP surgery |
| What it checks | Visual acuity, refraction, eye pressure, full eye health | Diabetic retinopathy specifically |
| Equipment | Snellen chart, phoropter, tonometer, slit lamp, ophthalmoscope | Digital retinal camera with mydriatic drops |
| Length | 20 to 30 minutes | 20 to 30 minutes including drops |
| Frequency | At your optometrist's recommended recall, usually 2 years if you attend DESP; sooner when clinically needed | From age 12: yearly, or every 2 years if your last two screens were clear |
| Updates your glasses prescription | Yes | No |
What the optometrist examines beyond the standard test
A standard NHS sight test covers visual acuity (sharpness on the Snellen chart), refraction (to find your prescription), intraocular pressure (a glaucoma indicator), slit lamp examination of the front of the eye, and ophthalmoscopy of the back of the eye. If you have diabetes the optometrist takes a longer look at the back of the eye and notes specific features.
The retinal examination looks for diabetic retinopathy (microaneurysms, dot and blot haemorrhages, exudates, cotton wool spots, and in more advanced disease, neovascularisation), diabetic macular oedema (thickening of the central retina), and cataract (which develops earlier and faster in diabetes). The optometrist is not the primary screening programme for retinopathy : that is DESP : but they will note findings and refer or coordinate as needed.
For context only, not as clinical advice: diabetic retinopathy is the leading cause of preventable sight loss in working-age adults in the UK. The two pathways exist side by side because together they catch sight-threatening disease earlier than either alone: DESP watches the retina on a fixed screening cycle, while the sight test covers everything else at the recall your optometrist sets.
How the NHS Diabetic Eye Screening Programme works
Once you are registered as having diabetes on your GP record, you are automatically invited into the NHS DESP. The first invitation arrives within around 12 weeks of diagnosis for adults, and from age 12 for children with diabetes. The invitation letter tells you the date, time, and location of your screening appointment.
At the appointment, drops are put into both eyes to dilate the pupils. The drops take around 20 minutes to work. A digital retinal camera then takes two photographs of each eye through the dilated pupil. The whole appointment takes around 30 minutes. You cannot drive home because the drops blur your vision for several hours; arrange transport.
The photographs are read by trained graders, not at the appointment. Results arrive by post within around six weeks. If background retinopathy is detected, you are recalled for annual screening as normal. If sight-threatening retinopathy or macular oedema is detected, you are referred to a hospital eye service for assessment.
Scotland, Wales, and Northern Ireland each run their own equivalent programmes on similar one-to-two-year cycles with the same screening standards. The branding differs (DRS in Scotland, DESS in NI) but the entitlement is equivalent.
Why people with diabetes should use both services
DESP screens specifically for diabetic retinopathy and macular oedema. It does not check your vision sharpness, it does not update your prescription, and it does not screen for unrelated eye conditions such as glaucoma or cataract. A standard sight test does all of those things.
If you only ever attend DESP, you can develop a degraded prescription or undetected glaucoma. If you only ever attend a high street sight test, the dedicated retinal photography of DESP and the trained-grader review system can catch retinopathy features that a single optometrist look might miss. Public health policy is built on the assumption you do both.
Practical tip: book the high street sight test around 6 months offset from your DESP screening. That way you have a clinical review of your eyes roughly every six months without paying anything.
Common questions
Do I get a free eye test on the NHS if I have diabetes?
Yes. Anyone diagnosed with diabetes (Type 1 or Type 2) qualifies for a free NHS sight test at any high street optician. The eligibility applies regardless of how well controlled the diabetes is, and regardless of which medication you take. You confirm the diagnosis to the optometrist at the appointment.
Is the NHS diabetic eye screening programme the same as a sight test?
No, they are different. The NHS Diabetic Eye Screening Programme (DESP) is a separate screening service run by regional NHS providers, on a one or two year cycle (since October 2023, people whose last two screens showed no retinopathy are invited every two years). It is a retinal photography scan to look specifically for diabetic retinopathy. A high street NHS sight test is a full visual examination covering acuity, refraction, pressure, slit lamp and retinal exam. Most people with diabetes attend both: the DESP screening by invitation, and the high street sight test at the interval their optometrist recommends.
How often does the NHS fund my sight test if I have diabetes?
The test itself is always free with diabetes, but the interval is set by your optometrist's clinical judgment, not by the diagnosis. Current College of Optometrists guidance is that if you attend NHS diabetic eye screening, your sight test recall should be the same as for someone without diabetes, typically every two years, because the screening programme is already watching for retinopathy. The NHS funds an earlier test whenever the optometrist considers it clinically necessary, for example if your vision has changed, and a funded test at 12 months for a diabetic patient is accepted where there is a clinical reason. What you are not entitled to is an annual test on demand without clinical need.
What proof of diabetes diagnosis do I need at the optician?
A GP letter, a current prescription for diabetic medication, an NHS app screenshot showing your diabetes diagnosis, or a hospital diabetes clinic letter all work. Most opticians accept a verbal declaration and ask for one piece of supporting evidence on first visit.
Do I get an OCT scan for free because I have diabetes?
Not automatically. The free NHS sight test covers the standard examination. An OCT scan is a private add-on at most chains (£10 at Specsavers, £25 at Boots, often included at Vision Express). However the NHS Diabetic Eye Screening Programme uses retinal photography (a different but related modality) and is fully NHS-funded.
What does the optometrist check for that relates to diabetes?
Beyond the standard examination, the optometrist looks for signs of diabetic retinopathy (microaneurysms, dot and blot haemorrhages, exudates, neovascularisation), diabetic macular oedema, and earlier development of cataract that is more common in diabetes. Findings are noted in your record and may prompt referral to ophthalmology or coordination with your DESP team.
Sources
Related guides
Diabetic eye screening cost
NHS DESP programme explained in detail.
Am I eligible for a free eye test?
Interactive checker for every NHS category.
Retinal photography cost
Fundus photo prices at UK opticians.
OCT scan cost
When the upgrade is worth paying for.
Free eye test over 60
Most over-60s with diabetes qualify on both grounds.
Free eye test for glaucoma
Diabetes also raises glaucoma risk.