Eligibility Criteria
astigmatism
REFRACTIVE ERROR, MYOPIA, ASTIGMATISM
Male and female participants aged 18 to 75 years who were eligible for bilateral PRK (1) had a normal eye exam except for refractive error at baseline, and (2) the planned myopia correction did not exceed −4.00 diopters (sphere) and 3.00 diopters of astigmatism, with spherical equivalent not higher than −4.50, confirmed by manifest refraction at baseline.The complete exclusion criteria are provided in 