What degree of myopia disqualifies a person from undergoing laser eye surgery?

Myopia appears to have become a “trend”—an increasing number of people are developing nearsightedness, experiencing blurred and indistinct vision, and seeking corrective measures—such as undergoing laser eye surgery at a hospital. So, what degree of myopia is considered unsuitable for laser eye surgery? Below, we provide answers to this question.

What Degree of Myopia Is Not Suitable for Laser Eye Surgery?

The two primary types of refractive surgery for myopia are excimer laser surgery and intraocular lens (IOL) implantation surgery. Excimer laser surgery requires patients to be aged 18–45 years, with myopia no greater than −15.00 diopters (D), hyperopia no greater than +5.00 D, and astigmatism no greater than ±6.00 D, and whose refractive error has remained stable over the past two years. For IOL implantation surgery—such as Implantable Collamer Lens (ICL) surgery—the correction range typically covers myopia from −3.00 D to −20.00 D. Candidates should generally be aged 18–45 years and ideally have no prior history of ocular surgery.

Knowledge Expansion: The Two Main Types of Myopia Surgery

1. Corneal Laser Surgery

This category of procedures corrects refractive errors by altering the anterior curvature of the cornea—thereby modifying its radius of curvature and reducing its refractive power. The most common method involves using an excimer laser to precisely ablate (remove) corneal tissue. The depth of ablation varies depending on the degree of myopia to be corrected. To ensure optimal postoperative visual outcomes and corneal structural integrity, a minimum residual corneal thickness must be preserved.

2. Phakic Intraocular Lens Implantation (e.g., ICL)

Also known as “Implantable Collamer Lens” (ICL) surgery, this procedure involves inserting a miniature, biocompatible, foldable lens into the eye through a minimally invasive incision—essentially placing an internal “contact lens” behind the iris but in front of the natural crystalline lens. This approach modifies the eye’s overall refractive power without removing or damaging any corneal tissue. As such, it is particularly suitable for patients with high myopia (up to −18.00 D to −20.00 D) who are ineligible for laser-based corneal procedures due to excessively high refractive error or insufficient corneal thickness.

The above outlines key considerations regarding “what degree of myopia is unsuitable for laser eye surgery.” Individuals with mild myopia may achieve natural visual improvement under the guidance of an ophthalmologist, whereas those with high myopia often require surgical intervention or other therapeutic approaches. We hope this information proves helpful. Wishing you good health and happiness!