What is glaucoma?
Glaucoma damages the optic nerve, the cable that carries images from the eye to the brain, most often because fluid pressure inside the eye is too high. The most common form, primary open-angle glaucoma, develops painlessly over years, quietly nibbling away peripheral vision before central sight is affected. It becomes more common with age, and risk is higher if you have a family history, are of Black African or Caribbean heritage, are very short-sighted or have diabetes.
Because early glaucoma causes no symptoms, it is usually picked up at a routine optician's eye test through pressure checks, optic nerve photographs and visual field tests. An ophthalmologist confirms the diagnosis with detailed scans and starts treatment — drops, laser or surgery — to lower the pressure and protect the remaining vision.
Common symptoms
- No symptoms at all in the early stages
- Gradual loss of peripheral (side) vision
- Blurred or patchy vision as the condition advances
- Haloes around lights
- In acute angle-closure glaucoma: sudden severe eye pain, redness and nausea
- Difficulty adjusting to dim light
How long will you wait?
Suspected glaucoma referrals are prioritised, but routine NHS appointments still commonly take three to five months, and stretched monitoring clinics mean follow-up reviews are frequently postponed.
Privately, you can typically see a consultant ophthalmologist within 3–7 days, with laser treatment or surgery usually arranged within 2–4 weeks if needed.
NHS England median referral-to-treatment wait: 12.4 weeks, with 2.5 million people waiting over 18 weeks (May 2026). Individual waits vary by trust and urgency.
Treatment options
- Pressure-lowering eye drops. Daily drops such as prostaglandin analogues reduce eye pressure and remain the mainstay of long-term treatment.
- Selective laser trabeculoplasty (SLT). A quick, painless outpatient laser that improves fluid drainage and is now often offered as a first-line alternative to drops.
- Minimally invasive glaucoma surgery (MIGS). Tiny stents or devices implanted to improve drainage, often combined with cataract surgery.
- Trabeculectomy. A traditional operation creating a new drainage channel, reserved for glaucoma that resists other treatments.
What does private treatment cost?
As a guide, a private glaucoma consultation with scans costs around £250–£450, SLT laser treatment roughly £1,000–£1,500 per eye, and glaucoma surgery £3,000–£5,500 depending on the procedure.
Does health insurance cover glaucoma?
Private medical insurance normally covers the diagnosis and acute treatment of newly detected glaucoma, including laser and surgery. Because glaucoma is a lifelong condition, ongoing routine monitoring and repeat prescriptions for drops usually fall under chronic condition exclusions and revert to the NHS or self-pay. Glaucoma diagnosed before your policy began is typically excluded as pre-existing.
Frequently asked questions
Can lost vision from glaucoma be restored?
No — sight lost to glaucoma cannot currently be brought back, which is exactly why early detection matters so much. Treatment is highly effective at lowering eye pressure and preventing or dramatically slowing further damage. Most people diagnosed early and treated properly keep useful vision for life, so regular eye tests every one to two years are the best protection.
Is laser treatment better than eye drops?
For many people with open-angle glaucoma, SLT laser is now offered first because a single five-minute treatment can control pressure for years, avoiding the cost, side effects and daily discipline of drops. It does not work for everyone and can be repeated or combined with drops later. Your consultant will advise based on your pressures, scans and preferences.
Will insurance cover my glaucoma long term?
Typically only the acute phase. Insurers will usually fund the initial investigations, laser treatment or surgery for glaucoma that develops after your policy starts. Once the condition is stable and simply needs lifelong monitoring and drops, it is classed as chronic, and most policies hand that ongoing care back to the NHS. Check your policy's chronic condition wording carefully.