Short-term refractive and corneal astigmatism after canal-based microinvasive glaucoma surgery

The Hydrus Microstent is neutral in refractive astigmatism when used as a stand-alone procedure. In contrast, combined implantation with phacoemulsification can induce changes in refractive astigmatism. Keratometry analysis confirmed that both anterior and posterior corneal astigmatism remain stable, indicating that refractive changes are likely due to internal factors associated with lens exchange rather than the stent itself. Therefore, when implanted alone, the Hydrus Microstent is unlikely to compromise the results of prior refractive treatments.