Some health problems give you no warning at all. No pain, no redness, no gradual dimming that prompts you to book an appointment. Diabetic retinopathy is one of them, and by the time most people notice a change in their sight, the damage at the back of the eye has often been building quietly for years. That is why Ireland runs a free national screening programme for it, and why so many people arrive at their first appointment feeling faintly ridiculous because their vision seems fine. It usually does. That is the point.
TL;DR
- Diabetic retinopathy is damage to the retina’s blood vessels caused by diabetes, and a leading cause of sight loss in working-age adults.
- Early retinopathy has no symptoms. You can have 20/20 vision and significant disease at the same time.
- Diabetic RetinaScreen is free through the HSE National Screening Service for everyone in Ireland with diabetes aged 12 and over: diabeticretinascreen.ie or freephone 1800 45 45 55.
- RetinaScreen is not an eye test. It does not check for glaucoma, cataracts, or your glasses prescription. You still need a separate optician appointment.
- Caught early, laser therapy and anti-VEGF injections preserve sight that would otherwise be lost.
- Blood glucose, blood pressure, cholesterol and stopping smoking all measurably slow progression.
What is happening in the eye
The retina is the light-sensitive layer at the back of the eye, fed by a network of very fine blood vessels. Persistently raised blood glucose damages their walls, so they leak, swell, and eventually close off.
Background retinopathy is the earliest stage, where tiny bulges called microaneurysms appear in the vessel walls. On its own it does not threaten sight. As things progress to pre-proliferative and then proliferative retinopathy, the retina responds to being starved of oxygen by growing fragile new vessels. These are the dangerous ones: they bleed, they scar, and they can pull the retina away from the back of the eye.
Running alongside this is diabetic maculopathy, where fluid leaks into the macula, the small central area responsible for reading and recognising faces. It is the most common reason people with diabetes lose reading vision, and it can develop even when the rest of the retina looks healthy.
Why waiting for symptoms is the wrong strategy
The retina has no pain fibres, and the brain is good at filling in patchy vision, so people can lose meaningful retinal function and genuinely not notice. Symptoms usually signal that things are already advanced: blurring that comes and goes, floaters drifting across your field of view, patches of missing vision, or difficulty reading print you managed fine last month. A sudden shower of floaters or a curtain across your vision needs same-day assessment.
Research from The Irish Longitudinal Study on Ageing (TILDA) has repeatedly highlighted how much diabetes in older adults in Ireland is undiagnosed or poorly controlled. If you have had a type 2 diagnosis for years and have never been screened, that gap matters.
How Diabetic RetinaScreen works
Diabetic RetinaScreen sits within the HSE National Screening Service, alongside BreastCheck, BowelScreen and CervicalCheck. It is free, and covers everyone in Ireland with type 1 or type 2 diabetes from age 12 upwards.
You do need to be on the register. Your GP or diabetes team will usually refer you, but referrals get missed and letters go astray, so check directly at diabeticretinascreen.ie or freephone 1800 45 45 55. Intervals are risk-based rather than automatically annual: consecutive clear screenings may move you to a longer interval, and changes mean you are seen more often.
The appointment takes roughly half an hour. A screener checks your vision, then puts dilating drops in both eyes. After about twenty minutes your pupils are wide enough for digital photographs of each retina, taken with a bright flash that is briefly dazzling and entirely harmless.
The detail people most often get caught out by: you cannot drive afterwards. The drops blur near vision and leave you very sensitive to light for four to six hours. Arrange a lift, take the bus, or bring your Free Travel Pass and sunglasses.
The gap nobody mentions: RetinaScreen is not an eye test
RetinaScreen photographs your retina and looks for one thing: diabetes-related damage. It does not measure the pressure inside your eye, so it will not pick up glaucoma. It does not assess lens clouding, so it will not tell you about cataracts. It does not refract your eyes, so it will not tell you your reading prescription has drifted.
People with diabetes are at higher risk of glaucoma and develop cataracts earlier than average, so assuming “the HSE checks my eyes every year” is a risky misunderstanding. You need both: RetinaScreen for retinopathy, and a full sight test for everything else. That test is often free too, through the PRSI Treatment Benefit Scheme or, for medical card holders, the HSE community ophthalmic service.
If something is found
A result letter arrives within a few weeks. Most report no retinopathy, or background retinopathy with routine recall. A referral to a hospital eye clinic usually means the ophthalmologist wants a closer look with scans that photographs cannot provide.
Treatment has improved substantially. Laser photocoagulation seals leaking vessels and calms the growth of new ones. Anti-VEGF injections, the same class of drug used for wet macular degeneration, are the mainstay for diabetic macular oedema and can restore vision as well as protect it. For advanced bleeding or retinal detachment, surgery called a vitrectomy is an option. The injections sound worse than they are; the eye is numbed thoroughly, and most people describe pressure rather than pain.
What you can influence
- Blood glucose. Sustained HbA1c improvement slows progression for years afterwards. Very rapid tightening can temporarily worsen retinopathy, so plan changes with your diabetes team.
- Blood pressure. Treating hypertension is one of the strongest protective factors for the retina, and often the more achievable target.
- Cholesterol. Raised lipids are linked to macular exudates and fluid leakage.
- Smoking. It damages small blood vessels everywhere, the retina included. HSE Quitline is free on 1800 201 203.
- Kidney function. Retinopathy and diabetic kidney disease travel together, so a change in one prompts checking the other.
If you hold a medical card or GP visit card, the HSE Chronic Disease Management Programme provides free six-monthly reviews in general practice covering exactly these measures.
Support if your sight is affected
Diabetes Ireland runs a helpline and local support groups. Vision Ireland, formerly the NCBI, provides rehabilitation, technology training and emotional support for people adjusting to sight loss. Fighting Blindness offers free counselling through its Insight service. The Blind Pension and Blind Welfare Allowance are means-tested payments for people whose sight loss meets the registration threshold, and Citizens Information will walk you through eligibility without charge.
The takeaway
Sight loss from diabetes is largely preventable, and almost all of that prevention happens in the years when you feel completely fine. So, two actions: check you are genuinely on the RetinaScreen register rather than assuming somebody put you there, and book a separate sight test with an optometrist, because the screening programme was never designed to do that job.
At Críonna Health we write about the practical side of ageing well in Ireland, including the entitlements that are easy to miss. Looking after your sight is rarely dramatic. It is mostly a matter of keeping two appointments you are probably entitled to for nothing.
This article is for general information and does not replace individual medical advice. If you notice any sudden change in your vision, contact your GP or an eye casualty department without delay.
📷 Photo by Centre for Ageing Better on Unsplash
