Clinical Research Directory

Inclusion Criteria: * Patients between 8 and 21 years old. Those who accept to participate in the study. The use of Ortho-K lenses for 8 to 10 hours per night, once the risks and benefits of using Ortho-K have been explained. * Refractive error of myopia between -1.00 and -5.00 diopters (D) with astigmatism of 1.50 D or less, with-the-rule. * Best-corrected visual acuity of 20/20 or better before treatment. * Ortho-K lens centered or decentered by no more than 0.5 mm radially, determined by slit-lamp examination. Exclusion Criteria: * History of hard contact lens use and contraindications for ocular and systemic Ortho-K, determined by a routine examination. * Patients who have previously undergone any refractive modulation procedure. * Patients with any corneal pathology, dry eye, glaucoma, retinal pathology, strabismus, ptosis, amblyopia, history of ocular allergy, or infection.