Laser eye surgery

Are you thinking of having laser eye surgery? It can be very effective. This guide explains what it is, how it works and the pros and cons.

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What is laser eye surgery?

Laser eye surgery is a very common kind of eye operation. In the UK, over 100,000 people have this kind of eye surgery done each year. While Specsavers doesn't offer laser eye surgery, many of our customers are interested in having it. This guide will give you an overview of the procedure.

Laser eye surgery explained

LASIK is the most common kind of laser eye surgery. Here's how it works:

  1. 1 of 3

    Cornea

    Slight variations in the shape of the cornea leads to vision problems.

  2. 2 of 3

    Corneal flap

    Using a laser, LASIK eye surgery cuts a small flap on the outer cornea, which is lifted up out the way.

  3. 3 of 3

    Laser ablation

    Laser beams are sent towards the eye and this removes tiny amounts of tissue. This changes the shape of the cornea. At the end of the surgery, the corneal flap is put back in place and reattaches on its own.

What does laser eye surgery involve? 

There are a few different types of laser eye surgery available in the UK, and we'll explore them in more detail below. They all use a laser (a very concentrated beam of light) to alter the shape of the cornea. The cornea is a clear, dome‑shaped structure on the outer part of the eye that covers the iris and the lens. The laser destroys some of the tissue in the cornea to change its shape. 

Learn more about long‑sightedness.

Why change the shape of the cornea? 

For you to see an object, light must bounce off it and pass through your cornea. The light reaches the back of your eye, where it meets a tissue called the retina, which turns light signals into electric signals. These are sent to your brain, which processes them into images. In an eye with perfect vision, the cornea helps focus light straight onto the retina. However, if the cornea is too flat, too pointy or misshapen, this affects how light reaches your retina. These issues cause things like short‑sightedness or long‑sightedness. By changing the shape of the cornea, laser eye surgery aims to 'fix' these problems. 

Learn more about astigmatism.


What to do if you're concerned about your vision

What to do if you're concerned about your vision. If you've noticed any problems with your sight, the most important first step is to get your vision problems diagnosed. Specsavers optometrists are highly skilled and can diagnose all kinds of sight problems.

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Types of laser eye surgery in the UK

There are different types of laser eye surgery, each working differently.

  1. LASIK eye surgery

    This is the most common. It uses two lasers. The first creates a flap on the front of your cornea that's lifted up. The second one removes a piece of the cornea below. The flap is then smoothed down.

  2. Surface laser treatments (PRK and TransPRK)

    One laser is used to directly reshape the outer surface of the cornea. It's as effective as LASIK, but can leave the outer surface of the eye more sore during recovery.

  3. Lenticule extraction (SMILE, CLEAR, SmartSight, SILK)

    This is a newer form of laser eye surgery. The laser makes a tiny slice in the side of the cornea, and a disk‑shaped piece of the cornea called a lenticule is removed to correct vision.

  4. LASEK eye surgery

    Alcohol is used to remove the outermost layer of the cornea, then a laser reshapes the cornea below. The outer layer ('epithelium') then needs to grow back after.

Intraocular lens (IOL) surgery 

IOL surgery is another kind of eye surgery that can significantly improve sight. It's different to laser eye surgery, because it doesn't use a laser. Instead, a small incision is made into your eye, and the lens is removed. The surgeon implants an artificial lens that helps you see better. IOL is the main treatment for cataracts. It's also a good option for people who can't have laser eye surgery.

Who could benefit from laser eye surgery? 

Millions of people around the world have had laser eye surgery. It could be a good option for you if you are: 

  • An adult ‑ In the UK, you can only normally get laser eye surgery if you're aged 18+. This is because younger people's vision tends to change, so the surgery might not offer long‑term benefits. 

  • You should have had a stable prescription for at least two years. If your prescription is changing a lot, it suggests your vision isn't stable. The eye surgery might change your cornea, but then your body could change it again. This could 'undo' the surgery. Learn more about how the eye works.

  • You have myopia, hyperopia or astigmatism ‑ Laser eye surgery is usually only suitable for people who have these three kinds of refractive errors. It's not useful for things like reading prescriptions (presbyopia). Learn more about presbyopia.

Who is laser eye surgery not suitable for? 

Laser eye surgery isn't suitable for everyone. If you're not sure if it's right for you, ask an optometrist at your local store. They can give you impartial advice based on your eye health. Laser eye surgery usually isn't an option if: 

  • Your vision has changed a lot recently. Many things can change your vision, including pregnancy, menopause, or simply getting older. You'll need to wait until your vision has stabilised. Learn more about why your eyesight is getting worse.

  • You're living with certain health conditions and taking medication ‑ Some health conditions might mean you can't have laser eye surgery. This includes immune disorders and HIV. Some medications might also mean you can't get eye surgery. 

  • You have certain eye conditions ‑ There are a few eye conditions that may make eye surgery less suitable for you. These include an inflamed cornea, uveitis, eye herpes, cataracts, glaucoma, keratoconus, and thin corneas, among others. Learn more about glaucoma.

Laser eye surgery FAQs

Written by our experts for peace of mind

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Ross Campbell

BSc Hons MCOptom Prof Cert Glauc Prof Cert Med Ret

Ross is an experienced optometrist having graduated in 2007 from Bradford University. He is also ophthalmic director of Specsavers Swaledale with Northallerton & Thirsk, a pre‑registration supervisor, professional advancement consultant, and a WOPEC Lead Assessor. He has previously worked as Director of Optometry Advancement for Specsavers and as a columnist for Optician & ProFile magazine.

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