What Is LASIK?

LASIK (Laser-Assisted In Situ Keratomileusis) is one of the most commonly performed elective surgical procedures in the world. It uses a precision laser to reshape the cornea — the clear front surface of the eye — to correct refractive errors including myopia, hyperopia, and astigmatism. For many people, the result is clear vision without the need for glasses or contacts.

Are You a Good Candidate?

Not everyone is suitable for LASIK. A thorough pre-surgical evaluation will assess your eligibility. Good candidates typically:

  • Are at least 18–21 years old (prescription should be stable for at least 1–2 years)
  • Have corneas of sufficient thickness
  • Have a refractive error within the treatable range
  • Do not have dry eye disease (or have it well-controlled)
  • Have no significant corneal abnormalities (e.g., keratoconus)
  • Are not pregnant or breastfeeding at the time of surgery

If you're not an ideal LASIK candidate, your surgeon may recommend alternatives such as PRK, SMILE, or implantable collamer lenses (ICL).

Before the Procedure

Preparation for LASIK typically involves:

  1. Comprehensive eye exam: Measures corneal thickness, mapping, pupil size, and prescription in detail.
  2. Stopping contact lens wear: You'll be asked to stop wearing soft contacts for at least 1–2 weeks before the evaluation, as contacts can temporarily change corneal shape.
  3. Arranging transport: You won't be able to drive immediately after surgery.
  4. Discussing medications: Inform your surgeon of any medications you take.

What Happens During LASIK?

The procedure itself takes roughly 15–30 minutes for both eyes and is performed while you're awake (though numbing drops are used so there's no pain):

  1. Numbing eye drops are applied.
  2. A thin flap is created in the outer corneal tissue using a microkeratome or femtosecond laser.
  3. The flap is gently folded back.
  4. An excimer laser reshapes the underlying corneal tissue based on your precise prescription.
  5. The flap is repositioned — it adheres naturally without stitches.

Most patients experience only mild pressure during the procedure. Vision may be blurry immediately after, but many notice improvement within hours.

Recovery: What to Expect

  • First 24–48 hours: Rest your eyes. Expect some dryness, mild irritation, or light sensitivity. Avoid rubbing your eyes.
  • First week: Vision improves rapidly. Avoid swimming, dusty environments, and strenuous activities. Use prescribed eye drops as directed.
  • One month: Most patients achieve stable, clear vision. Follow-up appointments are essential.
  • Full healing: Corneal healing continues for up to 3–6 months, though daily life is largely unaffected after the first week.

Potential Risks and Considerations

LASIK has an excellent safety profile, but it's important to understand that all surgical procedures carry some risk:

  • Dry eye symptoms (most common side effect, usually temporary)
  • Halos, glare, or starbursts around lights — especially at night
  • Under- or over-correction (may require a follow-up enhancement procedure)
  • Flap complications (rare with modern techniques)
  • In rare cases, a loss of best-corrected vision

Long-Term Outcomes

The majority of people who have LASIK achieve 20/20 vision or better. Results are generally stable, though natural age-related changes (such as presbyopia from your 40s onward) will still occur. Some patients choose reading glasses later in life regardless of prior LASIK surgery.

Is LASIK Worth It?

For suitable candidates, LASIK often provides a high degree of satisfaction and lasting freedom from corrective eyewear. The best step is a thorough consultation with a qualified ophthalmologist who can evaluate your eyes individually and set realistic expectations for your outcome.