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Am I a Good LASIK Candidate? Eligibility Requirements

Good LASIK candidates are generally adults 18 or older with a stable prescription for at least 1–2 years, adequate corneal thickness, no corneal disease, and mild to moderate dry eye at most. Astigmatism alone does not disqualify you. A thorough pre-operative evaluation with a refractive surgeon is the only way to confirm eligibility.

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What does a LASIK evaluation actually test?

The pre-operative screening exists to protect you — not to turn people away unnecessarily. It measures:

  • Corneal topography and tomography — a detailed 3-D map of the cornea's shape and thickness. This is the most critical screen. The surgeon needs enough tissue to safely reshape the cornea and still leave an adequate residual bed. It also detects early keratoconus (corneal thinning disease), which disqualifies LASIK 1.
  • Refraction — your current prescription, confirmed under dilated conditions.
  • Pupil size — large pupils in dim light have historically been associated with worse nighttime glare, though modern laser platforms have partially mitigated this concern.
  • Tear film and dry eye assessment — pre-existing dry eye is the most common reason candidacy is deferred or denied 2.
  • Full dilated eye exam — checking retinal health, as certain retinal conditions may require treatment before surgery.

Who is generally a good candidate?

You are likely a good candidate if you:

  • Are at least 18–21 years old (surgeons vary; many prefer 21 to allow full corneal maturation)
  • Have a stable prescription — unchanged for at least one to two years (year-over-year changes mean your eye is still growing or shifting) 1
  • Have adequate corneal thickness — to allow the laser ablation and leave a safe residual stroma of at least 250–300 microns 1
  • Fall within the treatment range of the laser system — most platforms effectively treat moderate to high myopia, low to moderate hyperopia, and most degrees of astigmatism 3
  • Have healthy corneas with no structural disease
  • Do not have significant dry eye — mild dryness is manageable; moderate or severe is usually a contraindication 2
  • Are not pregnant or breastfeeding — hormonal changes affect corneal curvature and tear production, and results may not be stable
  • Have corrected vision that you are happy with in glasses or contacts — LASIK aims to replicate that, not to improve beyond it

Can I get LASIK with astigmatism?

Yes, for most people. Modern excimer lasers treat astigmatism directly by correcting the uneven corneal curvature that causes it 3. The question is the degree: very high astigmatism may fall outside what can be safely corrected in a single treatment, or the prescription may interact with corneal thickness limits. Your topography results will answer this definitively.

What might disqualify me?

Corneal disease — keratoconus (the cornea progressively bulges), pellucid marginal degeneration, or other ectatic conditions are hard contraindications. Even subclinical (early, asymptomatic) keratoconus detected on topography is grounds for refusal because LASIK can accelerate the thinning 1.

Insufficient corneal thickness — if removing the needed tissue would leave too little residual stroma (generally under 250–300 microns), the risk of post-operative ectasia is too high. PRK may still be an option 1.

Uncontrolled glaucoma — the suction ring used in LASIK briefly raises intraocular pressure, which can be dangerous in poorly controlled glaucoma.

Significant dry eye — the procedure severs corneal nerves that regulate tear production; pre-existing moderate or severe dry eye is likely to worsen substantially 2.

Very high prescription — extreme myopia or hyperopia may be outside the safe ablation range for LASIK; implantable collamer lenses (ICLs) or refractive lens exchange are alternative routes 3.

Certain autoimmune or systemic conditions — diseases affecting wound healing (active lupus, rheumatoid arthritis, Sjogren's syndrome) may impair corneal recovery and are relative contraindications 1.

What if I'm disqualified — what are the alternatives?

Being told you are not a LASIK candidate is not the end of the road:

  • PRK — removes the surface epithelium instead of creating a flap; suitable for thinner corneas and many conditions that rule out LASIK, with a longer visual recovery 3.
  • SMILE — a flap-free laser procedure with similar correction range to LASIK.
  • Implantable Collamer Lens (ICL) — a lens placed inside the eye without removing corneal tissue; well-suited for high prescriptions or thin corneas.
  • Refractive Lens Exchange (RLE) — replaces the eye's natural lens with a prescription implant; typically reserved for older patients or very high prescriptions 3.

How Gale can help

LASIK candidacy requires an in-person ophthalmic evaluation — there is no way around it. Gale can help you find a refractive surgeon, prepare your question list, and, if you are deferred due to dry eye, work with you on primary-care approaches to optimize tear health before a re-evaluation 2.

Common questions

How old do I need to be for LASIK?

Most surgeons require at least 18 years, and many prefer 21. The main criterion is prescription stability, not a fixed age. Young adults whose prescription is still changing annually may be asked to wait regardless of age.

Can I get LASIK if I have had prior eye surgery?

It depends on the type. Previous refractive surgery, corneal procedures, or significant retinal surgery all affect candidacy differently. A surgeon needs your full surgical history and current measurements to assess this.

How should I prepare for the LASIK evaluation?

Stop wearing soft contact lenses for at least one week before the evaluation (rigid gas-permeable lenses for several weeks — your surgeon will specify). Contacts change the cornea's shape slightly, and accurate measurements require the cornea to be back at its baseline.

Will my insurance cover the LASIK evaluation?

Most insurance plans classify LASIK as elective and do not cover the procedure or its pre-operative evaluation. Flexible spending accounts (FSAs) and health savings accounts (HSAs) can often be used. Some vision plans offer discounts at participating providers.

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Conditions that usually rule out LASIK

  • —Keratoconus or other corneal ectatic disease — even a mild or suspected form
  • —Significant dry eye — likely to worsen after LASIK
  • —Thin corneas below the safe residual stroma threshold
  • —Prescription that has been changing year over year
  • —Active eye infection or uncontrolled eye disease

This article is educational and does not replace a consultation with a refractive surgeon or ophthalmologist. Only a full in-person pre-operative evaluation determines true LASIK candidacy. Gale can help you prepare for that appointment.

References

  1. 1.Jacobs DS, Lee JK, Shen TT, Afshari NA, Bishop RJ, Keenan JD, Vitale S; American Academy of Ophthalmology Preferred Practice Pattern Refractive Management/Intervention Panel (2023). Refractive Surgery Preferred Practice Pattern®. Ophthalmology. doi:10.1016/j.ophtha.2022.10.032 ✓LASIK candidacy criteria including corneal thickness thresholds, ectasia risk, contraindications (keratoconus, autoimmune disease), and prescription stability requirements
  2. 2.Amescua G, Ahmad S, Cheung AY, Choi DS, Jhanji V, Lin A, Mian SI, Rhee MK, Viriya ET, Mah FS, Varu DM; American Academy of Ophthalmology Preferred Practice Pattern Cornea/External Disease Panel (2024). Dry Eye Syndrome Preferred Practice Pattern. Ophthalmology. doi:10.1016/j.ophtha.2023.12.022 ✓Dry eye as a major contraindication to LASIK; pre-operative tear film assessment; post-operative dry eye worsening
  3. 3.Jacobs DS, Afshari NA, Bishop RJ, Keenan JD, Lee J, Shen TT, Vitale S; American Academy of Ophthalmology Preferred Practice Pattern Refractive Management/Intervention Panel (2023). Refractive Errors Preferred Practice Pattern®. Ophthalmology. doi:10.1016/j.ophtha.2022.10.031 ✓Treatment ranges for myopia, hyperopia, and astigmatism with excimer laser; PRK, SMILE, and ICL as LASIK alternatives; refractive lens exchange indications

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.