Can laser eye surgery correct short-sightedness?

How strong can your prescription be for laser eye surgery?

Laser eye surgery can treat a wide range of short-sighted prescriptions, including many people with moderate to high levels of myopia. The exact treatment range varies between procedures and depends on how much corneal reshaping would be needed to correct your vision safely.

Lower levels of myopia are usually considered to be up to around -3.00 dioptres, while prescriptions above roughly -6.00 dioptres are often described as higher short-sightedness. Many people within these ranges can still be suitable for treatment following detailed assessment.

Lower levels of short-sightedness are usually more straightforward to treat because less corneal tissue needs to be reshaped. 

Can astigmatism be treated as well?

Astigmatism can often be treated alongside short-sightedness. This happens when the cornea has an uneven curve that causes light to focus unevenly inside the eye.

Some people only have a small amount of astigmatism alongside their myopia, while others have higher levels that may influence which procedure is considered most appropriate. For more detail on how astigmatism is treated, see our guide to laser eye surgery for astigmatism.

What if your prescription is too high for laser eye surgery?

Laser eye surgery may not be the most suitable option if you’ve got very high levels of Myopia. In these situations, other procedures may still be discussed.

Implantable collamer lenses (ICL) correct vision by placing a lens inside the eye rather than reshaping the cornea itself. Lens-based procedures may also be considered in some cases, particularly when laser treatment would require too much corneal tissue to be removed safely.

Being told that laser eye surgery isn't the best option for your prescription doesn't automatically mean vision correction surgery is ruled out altogether. The decision usually comes down to which treatment is expected to provide the most stable long-term result for your eyes.

Does laser eye surgery permanently fix short-sightedness?

Laser eye surgery permanently reshapes the cornea to correct short-sightedness. Natural changes inside the eye can still develop later in life though, particularly as the lens gradually becomes less flexible with age.

This is why somebody can have stable distance vision for many years after laser eye surgery and still experience changes in their vision later on. The surgery changes how light focuses through the cornea, but it doesn't prevent ageing changes from developing inside the eye itself. Needing reading glasses in your forties or fifties is usually caused by presbyopia rather than the original treatment wearing off.

For a fuller explanation of how long results last and how vision changes over time, see our guide to laser eye surgery longevity.

What results can you expect after laser eye surgery?

After laser eye surgery, many people with myopia notice a clear improvement in distance vision. Driving, screen use, and sport often feel easier without having to think so much about glasses or contact lenses, particularly for people who've relied on them for a long time.

Independence from wearing glasses, or only needing to wear them occasionally, is a common result. Some patients may still have a small prescription left after they've fully recovered, and a small number go on to have enhancement treatment later if a residual prescription remains. 

Safety, recovery and cost

Laser eye surgery is considered safe for suitable patients with myopia when careful screening has been carried out beforehand. Most common side effects after treatment are temporary and improve as the eyes recover. For a full breakdown of risks, side effects and the safety record, see our guide to laser eye surgery safety.

Recovery patterns differ between procedures, with LASIK and SmartSight generally settling faster than LASEK or PRK. For a day-by-day breakdown of what to expect, see our guide to laser eye surgery recovery.

When laser eye surgery may not be the best option for myopia

Laser eye surgery isn’t suitable for everybody with myopia, even when the prescription itself falls within the normal treatment range.

Treatment may not be recommended if the cornea is too thin, if detailed scans show irregular corneal shape, or if short-sightedness is still changing noticeably over time. Very high levels of myopia can also limit how safely the cornea can be reshaped, because stronger prescriptions require more tissue to be removed during treatment.

Conditions such as keratoconus, where the cornea is already weaker or less stable than expected, can increase the risk of the cornea changing shape after laser treatment. This is why detailed corneal scans are such an important part of assessment before surgery is recommended.

When corneal laser surgery isn’t considered the safest option, alternatives such as Implantable Collamer Lens (ICL) surgery or refractive lens exchange may still be discussed instead. Glasses and contact lenses also remain effective long-term ways of managing myopia.

Next steps

Laser eye surgery can be a very effective way to correct short-sightedness, although the most appropriate treatment varies from person to person.

Procedures such as LASIK, SmartSight™ and LASEK can allow patients with myopia to reduce how much they rely on wearing glasses or contacts. Some eyes are better suited to lens-based alternatives, such as ICL surgery instead, particularly when corneal laser treatment may not be the safest option long term.

A consultation is the only way to assess this properly. Detailed scans and measurements allow your surgeon to understand how your eyes are structured, how stable your prescription has been over time, and which treatment is likely to provide the safest and most predictable outcome for your vision.