Can You Undergo Vision Correction Surgery with 600-Degree Myopia?

Individuals with myopia of -6.00 diopters (D) are generally considered candidates for refractive surgery, provided they meet other essential eligibility criteria. A spherical equivalent of -6.00 D falls within the FDA-approved treatment range for both LASIK and SMILE procedures—typically up to -8.00 D to -10.00 D for myopia, depending on corneal thickness, curvature, and overall ocular health.

However, eligibility is never determined by refractive error alone. Comprehensive preoperative evaluation is mandatory and includes measurement of central corneal thickness (ideally ≥500 µm), assessment of corneal topography to rule out ectasia risk, evaluation of pupil size under scotopic conditions, and exclusion of contraindications such as keratoconus, active ocular inflammation, uncontrolled dry eye syndrome, or systemic conditions affecting wound healing (e.g., uncontrolled diabetes or autoimmune disease).

For patients at the higher end of the treatable myopia range—such as those with -6.00 D or greater—surgeons often prioritize tissue-sparing techniques like SMILE (small incision lenticule extraction) over traditional LASIK, particularly when corneal thickness or biomechanical stability is a concern. Photorefractive keratectomy (PRK) remains a viable alternative, especially for individuals with thinner corneas or occupations involving physical contact risk (e.g., military personnel or athletes).

It is critical to emphasize that stable refraction—defined as less than 0.50 D change in spectacle prescription over the preceding 12 months—is required before proceeding. Patients must also demonstrate realistic expectations: while refractive surgery aims for independence from corrective lenses, outcomes vary, and some may still require low-power reading glasses after age 40 due to presbyopia.

Ultimately, candidacy is individualized. A thorough consultation with a board-certified cornea or refractive surgeon—including advanced diagnostics such as wavefront aberrometry and anterior segment OCT—is indispensable to determine the safest and most effective modality.