Eye surgery on this site covers two broad groups: refractive procedures that aim to reduce dependence on glasses or contact lenses, and cataract surgery, which replaces a lens that has become cloudy. Blurred or changing vision has many causes, some of them serious, so an eye examination to find the cause comes before any discussion of surgery.3
In short
Glasses and contact lenses remain effective, legitimate ways to correct short sight, long sight and astigmatism.24 Laser and lens surgery are options for some adults, but not everyone is suitable, and the NHS does not provide them for correcting a glasses prescription.4 Cataract surgery is different: it is the only way to remove a cataract, and it is usually considered once a cataract affects daily life.1 Sudden changes in vision need urgent assessment, not a surgery plan.
What this field covers
- Laser refractive surgery: reshaping the cornea (the clear front window of the eye) with procedures such as LASIK (laser-assisted in situ keratomileusis), SMILE (small incision lenticule extraction) and PRK (photorefractive keratectomy).
- Lens-based refractive surgery: replacing the eye’s natural lens with an artificial one, an option for some adults,4 or placing an implantable lens in front of the natural lens.
- Cataract surgery: replacing a cloudy natural lens with an artificial one.1
- Corneal treatments: such as cross-linking for keratoconus (a condition in which the cornea thins and bulges).
Start with the cause
| Concern or symptom | Possible causes | Usual first step / type of specialist |
|---|---|---|
| Blurred distance or near vision corrected by glasses | Short sight, long sight, astigmatism, age-related loss of near focus | Optometrist eye test; refractive surgeon only if surgery is being considered |
| Cloudy vision, halos around lights, colours less bright | Cataract, but also other eye conditions3 | Optometrist, then ophthalmologist (eye surgeon) |
| Distorted central vision or difficulty seeing faces | Age-related macular degeneration (AMD), which no refractive procedure treats3 | Prompt optometrist or eye clinic review |
| Gradually worsening sight with diabetes | Diabetic retinopathy3 | Eye clinic and diabetes team |
| Dry, gritty or tired eyes | Dry eye disease, screen use, eyelid problems; dry eye can also rule out or complicate laser surgery2 | Optometrist or GP |
Main types of option
| Option | What it can do | What it cannot do |
|---|---|---|
| Glasses or contact lenses | Correct most refractive errors without surgery4 | Need ongoing use and replacement |
| Laser refractive surgery | May reduce dependence on glasses for short sight, long sight and astigmatism2 | Unsuitable for some eyes, such as thin corneas or persistent dry eye; vision can drift back towards the original prescription2 |
| Lens-based refractive surgery | An option for some adults4 | Is intraocular (inside the eye) surgery, with the risks that brings |
| Cataract surgery | Removes a cloudy lens and replaces it with an artificial one1 | Does not treat retinal or optic nerve disease; vision can become cloudy again later because of posterior capsule opacification1 |
| Monitoring without surgery | Reasonable for an early cataract that is not yet affecting daily life1, and for anyone happy with glasses | Does not reverse a cataract |
What cannot be decided online
Suitability for refractive surgery depends on measurements taken in person: corneal thickness and shape, pupil size, tear film, and whether the prescription has been stable. Recent vision changes linked to medicines, hormones, pregnancy, breastfeeding or age, and conditions such as glaucoma, cataract or autoimmune disease, can make laser surgery less predictable or unsuitable.2
For cataract surgery, a full examination is needed to check the retina and optic nerve, measure the eye to choose the artificial lens power, and judge how much of the blurred vision the cataract actually explains. These measurements cannot be taken remotely, and the results decide which options, if any, are reasonable.
When to seek urgent medical help
The NHS advises going to A&E or calling 999 if you suddenly cannot see from one or both eyes, or suddenly have severe eye pain, and not driving yourself there.3 Get urgent advice from a GP or NHS 111 for:13
- floaters that suddenly appear or increase, or flashes of light
- a dark curtain or shadow moving across your vision, which can be a sign of retinal detachment
- vision that suddenly becomes blurred, or new double vision
- a red and painful eye, or eyes that hurt in bright light
Guides in this section
Eyelid and brow concerns are covered under facial surgery. For planning around travel, see aftercare after treatment abroad.
Common questions
- Who May Not Be Suitable for Laser Eye Surgery?
- LASIK vs SMILE: What Is the Difference?
- LASIK vs PRK/LASEK: What Is the Difference?
- How Common Is Dry Eye After Laser Eye Surgery?
- Can Laser Eye Surgery Fix Reading Vision?
- What Is an Implantable Collamer Lens (ICL)?
- What Is Refractive Lens Exchange?
- Multifocal Lenses in Cataract Surgery: Pros and Cons
- How Long Is Recovery After Cataract Surgery?
- Why Can Vision Become Cloudy Again After Cataract Surgery?
- What Is Corneal Cross-Linking for Keratoconus?
- When Can You Fly After Eye Surgery?
Sources
- NHS. Cataract surgery. NHS website. https://www.nhs.uk/tests-and-treatments/cataract-surgery/. Accessed 5 November 2026.
- Mayo Clinic. LASIK eye surgery. Mayo Foundation for Medical Education and Research. https://www.mayoclinic.org/tests-procedures/lasik-eye-surgery/about/pac-20384774. Accessed 5 November 2026.
- NHS. Vision loss. NHS website. https://www.nhs.uk/conditions/vision-loss/. Accessed 5 November 2026.
- NHS. Short-sightedness (myopia). NHS website. https://www.nhs.uk/conditions/short-sightedness/. Accessed 5 November 2026.