central corneal thickness
Meta-analyses were performed on the primary outcomes [loss of >= 2 lines of corrected distance visual acuity (CDVA), uncorrected distance visual acuity (UDVA) >= 20/20, spherical equivalent (SE) within   0.50 diopters (D), final refractive SE], secondary outcomes were high-order aberrations (HOAs) and corneal biomechanical [central corneal thickness (CCT), corneal hysteresis (CH) and corneal resistance factor (CRF)].