Toric IOL: Rotational Stability of the Blue Light-absorbing Hydrophobic Acrylic Posterior Chamber Single Piece Intraocular Lens (Model YST0.00)

TModern toric IOLs typically show a mean absolute rotation of 3° to 5° , which would result in a loss of about 10% to 15% of the astigmatism reducing effect of the toric IOL. Rotational stability of a toric IOL depends on the in teraction between the toric IOL and the posterior capsule, whereas misalignment of the toric IOL depends on several factors additionally to rotational stability. Intraoperatively, misalignment may happen due to cyclotorsion of the eye in the lying position or due to peribulbar anaesthesia, and due to imprecision of the surgeon when positioning of the IOL relative to the intended meridian.

The primary objective of this study is to evaluate rotational stability of the investigational device implanted after cataract surgery. The primary endpoint is angle of intraocular lens rotation between the day of surgery and postoperative 6 months.