Using Phototherapeutic Keratectomy to Precisely Mark the Axis of Astigmatism in Adults

What this Trial Is About

This research aims to improve correction of astigmatism during corneal refractive surgery by using phototherapeutic keratectomy PTK mode to precisely mark the axis of astigmatism. Astigmatism correction is challenging because it involves both magnitude and direction, and errors can occur due to head or eye rotation. The study explores using excimer laser therapeutic keratectomy to set laser parameters for accurate axis marking, aided by static cyclotorsion of the eye. Participants will be divided into two groups one receiving the PTK mode marking procedure experimental group and one with no intervention limbus group. The PTK mode aims to precisely mark the astigmatism axis using laser treatment. The study is non-randomized and open-label, with no masking. No additional treatments or procedures beyond the marking are described. During the study, researchers will measure participants eye refraction three months after the procedure to assess the accuracy of astigmatism correction. Participants must be at least 18 years old and free of ocular diseases. The trial also allows healthy volunteers. The total duration and follow-up details focus mainly on the primary outcome at three months post-treatment.

Application of Phototherapeutic Keratectomy Mode to Mark the Axis of Astigmatism