LASIK Disqualifying Conditions: Who Cannot Get Laser Eye Surgery

Keratoconus and Corneal Ectasia Disorders

Keratoconus is an absolute contraindication for LASIK. This progressive corneal disease involves thinning and forward bulging of the cornea; performing LASIK on a keratoconus cornea removes additional structural tissue from an already weakened structure, accelerating the ectatic progression and potentially causing severe, irreversible vision loss. Even forme fruste keratoconus (very early, subclinical disease detectable only on topography) is a contraindication at most responsible centers.

Other corneal ectasia disorders — pellucid marginal degeneration, keratoglobus — are similarly absolute contraindications. Patients with these conditions have excellent alternatives including corneal crosslinking (to halt progression), scleral contact lenses (for optical correction), and possibly ICL surgery (which requires no corneal tissue removal).

Severe Dry Eye Disease

Moderate-to-severe dry eye is a significant contraindication for LASIK because the procedure temporarily disrupts corneal nerves, worsening tear production and stability for 3–6 months post-operatively. In patients with pre-existing severe dry eye, this can lead to chronic, debilitating ocular surface disease after surgery. Patients with mild-to-moderate dry eye may be candidates with pre-treatment and careful management, but severe dry eye (Schirmer test <5 mm/5 min, very low TBUT) is generally disqualifying for LASIK specifically — though PRK or SMILE (which preserves more corneal nerves) may be alternatives. See LASIK with dry eyes for detailed assessment.

Glaucoma

Active, uncontrolled glaucoma is a contraindication for LASIK. During flap creation, a suction ring is applied to the eye, temporarily elevating intraocular pressure (IOP) to 60–80 mmHg. This pressure spike can damage the optic nerve in patients with existing glaucomatous damage. Additionally, post-LASIK corneal thinning permanently alters IOP readings, making glaucoma monitoring less accurate for the rest of the patient's life — a significant concern for those who already need careful IOP monitoring.

Patients with well-controlled, early glaucoma and healthy optic nerves may occasionally be considered for LASIK after careful risk-benefit discussion, but this is an exception rather than the rule.

Cataracts

A cataract — clouding of the natural crystalline lens — causes progressive vision blurring that LASIK cannot address. LASIK corrects only the corneal component of refraction and cannot clear a cloudy lens. For patients with cataracts significantly affecting vision, cataract surgery (with premium IOL implantation for refractive correction) is the appropriate treatment. LASIK can be performed after cataract surgery in some cases as a "touch-up" to fine-tune the IOL's refractive outcome, but cannot substitute for treating the cataract itself.

Autoimmune and Systemic Diseases

Several systemic diseases can impair corneal wound healing after LASIK and are relative or absolute contraindications:

• Sjögren's syndrome — causes severe dry eye; absolute contraindication
• Rheumatoid arthritis (active) — can impair healing; relative contraindication
• Lupus (SLE) — corticosteroid requirements post-LASIK may be inadequate or contraindicated
• HIV/AIDS (uncontrolled) — impaired immune response affects healing
• Diabetes mellitus (poorly controlled) — elevated HbA1c and corneal neuropathy impair healing; well-controlled diabetes may not disqualify
• Isotretinoin (Accutane) use — causes severe dry eye; surgery should be postponed until 6–12 months after cessation

Unstable Prescription

An unstable or progressing refractive error disqualifies patients from LASIK regardless of age. If your prescription has changed more than 0.50 D in the past 12 months, most surgeons will require waiting for stability. Performing LASIK on an unstable prescription often results in regression — the prescription partially returns as the underlying anatomical changes that caused the initial progression continue. See LASIK age requirements and prescription stability.

Other Disqualifying Factors

• Corneal disease — corneal dystrophies (especially Fuchs endothelial dystrophy), prior herpes simplex keratitis
• Very thin corneas — see corneal thickness requirements
• Extremely large pupils — pupils larger than 7–8 mm in mesopic conditions increase night-vision side effects; technology-dependent
• Pregnancy or breastfeeding — see LASIK during pregnancy
• Unrealistic expectations — patients who cannot accept the small risk of needing glasses for some activities post-LASIK are poor psychological candidates

Alternatives for Patients Who Cannot Have LASIK

Disqualifying Condition	Best Alternative
Keratoconus	Crosslinking, scleral lenses, ICL
Thin corneas	PRK, SMILE, ICL
High prescription beyond LASIK range	ICL, RLE
Severe dry eye	PRK, SMILE (lower dry eye risk), treat dry eye first
Cataracts	Cataract surgery with premium IOL
Presbyopia over 50	RLE with multifocal IOL