How many degrees of myopia can no longer undergo surgery?

Myopia surgery, commonly referred to as laser vision correction procedures such as LASIK (Laser-Assisted In Situ Keratomileusis), PRK (Photorefractive Keratectomy), or SMILE (Small Incision Lenticule Extraction), is not solely determined by the degree of myopia. Instead, multiple factors must be considered comprehensively: 1. Refractive range: Most surgical centers generally recommend that candidates for LASIK or PRK have myopia up to -10.00 diopters (D) (1000 degrees) and astigmatism up to -6.00 D (600 degrees). For SMILE surgery, the acceptable range is relatively lower, typically around -8.00 D (800 degrees). 2. Corneal thickness: The procedure alters the corneal shape, making corneal thickness a critical factor. If the cornea is too thin, the surgery may not be safely performed, or it could lead to postoperative corneal instability. 3. Age and stability: It is generally recommended that patients have stable myopia for at least two years prior to surgery and be over 18 years of age, as visual development in minors may still be ongoing.