LASIK Risks and Side Effects: A Balanced Guide Before Consent

Temporary symptoms and changes in vision

Dryness, irritation, light sensitivity, fluctuating clarity, glare, halos, starbursts or ghost images may occur after refractive surgery. Some symptoms improve as the eye heals; some can persist or interfere with particular tasks. The likelihood and duration vary. Ask what symptoms are expected for the exact procedure proposed and what should trigger a call.

The FDA’s patient information describes both potential problems and questions to consider, while the Academy of Ophthalmology also discusses common experiences and complications. Statistics from a study or a different laser cannot predict what will happen to one person. If a clinician quotes a number, ask which patient population, device, follow-up period and outcome measure it describes.

Residual prescription and additional treatment

The intended correction may be under- or over-achieved, and a person may still need glasses or contacts for some tasks. Prescription can change later for reasons unrelated to the procedure. Some patients may be considered for another treatment, but enhancement is not automatic: the cornea must be assessed again and further surgery may be unsafe or not recommended.

Ask before consenting what happens if vision is not as expected. Clarify how the clinic evaluates a residual prescription, which options may remain and whether any additional procedure is included in the estimate. A commercial promise should not suggest that tissue can always be treated again.

Corneal, flap and healing complications

LASIK changes the structure of the cornea and creates a flap. Problems can involve flap healing, inflammation, infection, corneal shape changes or other findings requiring prompt assessment. PRK, SMILE and lens-based procedures have different risks; an alternative is not automatically risk-free. The personal eye examination helps the surgeon consider which risks matter most.

A very thin or irregular cornea, dry eye, prior surgery, some health conditions and certain medicines may affect candidacy or healing. Tell the surgeon the full history, even if a detail seems unrelated. Ask what additional testing is recommended and whether a condition should be treated before any elective procedure is considered.

Night vision, dry eye and daily function

Night glare or halos can be especially important for people who drive after dark, work in low-light settings or already notice visual symptoms. Pupil conditions, prescription, eye surface and other measurements may inform the conversation. Explain the tasks that matter in your life so consent is tied to real function rather than a chart result alone.

Dry eye should be discussed before surgery and during recovery. Report burning, grittiness, fluctuating focus or contact-lens intolerance. Do not assume that a mild symptom is irrelevant or that a particular procedure guarantees freedom from dryness. The clinician can assess whether treatment or further observation is appropriate.

How to give informed consent

Consent should be voluntary and based on a conversation you understand. Ask the clinician to describe the proposed procedure, expected benefit, meaningful alternatives—including no surgery—and risks that apply to your measurements. Ask what the plan is if the result is different than hoped. You should have time to read the form and ask follow-up questions.

Be cautious if someone guarantees perfect vision, says complications never happen, dismisses questions or presses you to book immediately. A second opinion is reasonable for elective surgery. Keep a copy of your prescription, maps, consent paperwork and post-operative records for future eye care.

Questions to take to the surgeon

• Which risks are most relevant to my cornea, tear film, pupils, prescription and medical history?
• What symptoms are expected, and which symptoms need same-day or urgent attention?
• How could this procedure affect night driving, dry eye or my specific work and hobbies?
• If some prescription remains, what treatment options are possible—and what could make more surgery unsafe?
• What alternatives do I have, including delaying or declining surgery?