Laser eye surgery Risks & Side Effects Explained by Surgeons

Laser eye surgery risks include temporary dry eye, fluctuating vision, glare and halos, while more serious complications are uncommon but can affect visual quality or require further treatment. A detailed eye assessment helps determine whether laser vision correction is appropriate and how risks can be reduced.

Overview: What Are the Risks of Laser Eye Surgery?

Laser eye surgery risks are generally low when patients are carefully selected and surgery is performed by an experienced ophthalmic team. Common effects such as dry eyes, glare around lights, mild discomfort and changing vision are usually temporary. However, as with any procedure involving the eye, there are uncommon complications that may affect sight and may need additional treatment.

Laser vision correction reshapes the cornea, the clear front surface of the eye, to improve how light focuses on the retina. It can reduce dependence on glasses or contact lenses for people with short-sightedness, long-sightedness or astigmatism. It does not guarantee perfect vision, and some people may still need glasses for certain tasks, particularly reading as they get older.

The safest approach is an individual one. Before deciding on surgery, an ophthalmologist reviews eye health, corneal shape and thickness, prescription stability, general medical history, lifestyle needs and realistic expectations. Patients can learn more about the procedure through laser eye surgery.

How Laser Vision Correction Works

Laser vision correction changes the curvature of the cornea using a highly controlled laser. In LASIK, a very thin corneal flap is created and lifted before the underlying tissue is reshaped. The flap is then returned to its position. In surface laser treatments, such as PRK, the surface layer is removed or moved aside before laser reshaping takes place, then heals over several days.

Different techniques may suit different eyes. The choice can depend on corneal thickness, corneal topography, the degree and type of refractive error, dry-eye symptoms, contact sports, occupational demands and other clinical factors. A surgeon should explain why a particular approach is recommended, as well as its alternatives.

Laser treatment corrects refractive error at the time of surgery, but eyes can continue to change naturally. Age-related loss of near focus, known as presbyopia, commonly develops from the 40s onward and is not prevented by standard laser correction. Cataracts and other eye conditions can also arise later in life independently of prior laser surgery.

Who May Be a Suitable Candidate?

Suitable candidates are usually adults whose glasses or contact lens prescription has been stable for a period of time. They need healthy corneas and no untreated eye disease that could make healing less predictable. A comprehensive assessment commonly includes refraction testing, corneal mapping, corneal thickness measurement, tear-film evaluation and a detailed examination of the front and back of the eye.

Laser eye surgery may be postponed or considered unsuitable for people with certain findings, including unstable prescriptions, unusually thin or irregular corneas, active eye infection, significant dry-eye disease, uncontrolled diabetes, some autoimmune conditions or pregnancy and breastfeeding. These situations do not always rule out treatment permanently, but they require individual medical advice.

People with keratoconus or suspected corneal weakening need specialist assessment rather than routine laser correction. This condition changes the shape and strength of the cornea and may require different care, such as keratoconus assessment and treatment.

Contact lens wear can temporarily alter corneal measurements. The eye team may ask patients to stop wearing lenses for a specified period before testing, especially rigid gas-permeable lenses. This helps ensure that surgical planning is based on stable, accurate measurements.

What Happens During the Procedure?

Laser eye surgery is usually an outpatient procedure. On the day, the eye is numbed with anaesthetic drops. Patients remain awake, but the procedure itself is typically brief. An eyelid holder prevents blinking, and the surgical team provides clear instructions on where to look.

For LASIK, the surgeon creates a corneal flap with a femtosecond laser or, less commonly, a mechanical device. An excimer laser then reshapes the corneal tissue according to the planned correction. For surface treatments, the corneal surface layer is treated first, and a protective contact lens may be placed while the surface heals.

Patients may notice pressure, lights or sounds during treatment, but significant pain during the procedure is not expected. Afterward, vision can be hazy and the eye may feel scratchy, watery or sensitive to light. A responsible adult may be needed to accompany the patient home, as driving immediately afterward is not safe.

Common Side Effects and Recovery Timeline

Early recovery varies by technique and by person. After LASIK, many people notice functional improvement within a day or two, although vision can fluctuate for weeks. Surface treatments often involve more discomfort during the first few days, and visual clarity may improve more gradually over several weeks or longer.

Dry-eye symptoms are among the most common side effects. They may cause burning, grittiness, watering, fluctuating vision or discomfort with screens and air conditioning. Lubricating drops and other treatments recommended by the ophthalmologist can help. Symptoms often improve as corneal nerves recover, although a small number of people have longer-lasting dryness.

Some people experience glare, starbursts, halos around lights or reduced contrast sensitivity, particularly when driving at night. These effects are often most noticeable early in healing and usually lessen over time. They may be more relevant for people who drive frequently at night or work in visually demanding low-light environments.

• First 24 to 48 hours: watery eyes, light sensitivity, mild discomfort and blurred or variable vision can occur.
• First weeks: dryness and visual fluctuations are common; follow-up appointments monitor healing.
• First months: vision and night-time symptoms often continue to settle, though the exact timeline differs between procedures.

Less Common Risks and Potential Complications

Serious complications are uncommon, but patients should understand them before choosing surgery. These can include infection, inflammation, delayed epithelial healing, flap-related problems after LASIK, corneal haze after surface procedures and a result that undercorrects or overcorrects the prescription. In some cases, glasses, contact lenses or an enhancement procedure may be considered after the eye has stabilised.

Rarely, vision may not be as sharp as it was with the best glasses or contact lens correction before surgery. Persistent glare, halos, double vision, poor night vision or chronic dry eye can affect quality of life. Very rarely, corneal weakening known as ectasia can develop after surgery, especially if an underlying corneal vulnerability was not detected during screening.

Risk is reduced, but never completely removed, by thorough preoperative testing, appropriate technique selection and careful aftercare. Patients should disclose all eye symptoms, medications, medical conditions and previous surgery. They should also ask about their own risk factors rather than relying only on general descriptions of outcomes.

Benefits, Expectations and Safe Self-Care

The potential benefit of laser vision correction is reduced reliance on glasses or contact lenses in everyday life. Many people achieve good distance vision, but results vary according to the original prescription, eye anatomy, healing response and age. A successful outcome should be viewed as improved functional vision rather than a promise that glasses will never be needed again.

After surgery, patients should use prescribed drops exactly as directed and avoid rubbing the eyes. Swimming pools, hot tubs, dusty environments, eye makeup and contact sports may need to be avoided for a period advised by the surgeon. Protective shields may be recommended while sleeping in the first stage of recovery, especially after flap-based surgery.

Regular follow-up is important even if vision seems clear. These appointments allow the team to check corneal healing, eye pressure, tear film and vision quality. Patients should not use non-prescribed eye drops or restart contact lens use unless their clinician says it is safe.

Acibadem International’s multidisciplinary eye specialists and JCI-accredited hospitals assess and treat laser vision correction candidates, including international patients, with care plans based on individual eye findings.

When to Seek Medical Care

Patients should contact their eye surgeon promptly if they have increasing pain, worsening redness, a sudden reduction in vision, new marked light sensitivity, discharge, or a feeling that something is seriously wrong with the treated eye. These symptoms do not always mean there is a complication, but early assessment is important because some problems need prompt treatment.

Urgent medical assessment is also appropriate after an eye injury, particularly in the early recovery period. People who notice flashes of light, a sudden increase in floaters or a curtain-like shadow in their vision should seek urgent eye care, as these can be symptoms of a retinal problem unrelated to the cornea.

For non-urgent concerns, such as ongoing dryness, night-time glare or uncertainty about returning to work, exercise or driving, patients should discuss symptoms at a scheduled follow-up or contact their ophthalmology team. Individual guidance is safer than comparing recovery with another person’s experience.

Frequently asked questions

Are laser eye surgery risks common?

Temporary side effects such as dry eyes, light sensitivity and fluctuating vision are relatively common during healing. Serious complications are uncommon, particularly when patients are appropriately screened and follow aftercare instructions. An ophthalmologist can explain the risks that apply to an individual eye.

Can laser eye surgery cause permanent dry eyes?

Dry-eye symptoms are often temporary because corneal nerves need time to recover after surgery. A smaller number of people can have persistent symptoms, especially if they had dry eye before treatment. Preoperative tear-film testing and treatment of existing dryness can help reduce this risk.

Will night vision problems go away after LASIK?

Halos, glare and starbursts can occur during the early healing period, especially in low light. These symptoms often improve over weeks to months as the cornea heals and the visual system adapts. Persistent or severe night-vision symptoms should be reviewed by the eye surgeon.

Can laser eye surgery make vision worse?

Most patients have improved uncorrected vision, but there is a small risk of reduced visual quality or reduced best-corrected vision. Problems can include persistent dry eye, irregular corneal shape, glare or an inaccurate correction. Careful screening and follow-up are important safeguards, although they cannot eliminate all risk.

How long does recovery take after laser eye surgery?

Recovery depends on the laser technique and the person’s healing response. LASIK often allows useful vision within a few days, while surface laser treatments can take longer for comfort and clarity to improve. Full visual stabilisation may continue over weeks or months.

Who should not have laser eye surgery?

People with unstable prescriptions, certain corneal abnormalities, active eye disease or significant untreated dry eye may not be suitable at that time. Pregnancy, breastfeeding and some medical conditions can also affect timing or candidacy. A full ophthalmic assessment is needed to make a safe decision.

References

• American Academy of Ophthalmology
• U.S. Food and Drug Administration
• Royal College of Ophthalmologists
• National Eye Institute
• European Society of Cataract and Refractive Surgeons

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.