How many degrees of vision impairment disqualify someone from undergoing laser eye surgery?

Laser eye surgeries, such as laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK), generally have specific refractive ranges. Typically, candidates suitable for laser vision correction surgery have myopia (nearsightedness) ranging from -1.00D to -12.00D, and hyperopia (farsightedness) ranging from +1.00D to +8.00D. Note that suitability for surgery depends not only on the refractive error but also on several other factors, including corneal thickness, intraocular pressure, ocular health, age, general health, and expected visual outcomes. Even if the refractive error falls within the acceptable range, surgery may not be appropriate if the cornea is too thin or if other eye diseases are present. Additionally, the surgeon will evaluate whether the procedure is suitable based on the individual's visual needs and lifestyle.