Rotational Stability of a New Progressive Toric Hydrophobic Intraocular Lens With Gradually Decreasing Cylinder Power

To investigate the rotational stability of a new hydrophobic C-loop one-piece toric intraocular lens (IOL).

In this retrospective multicenter case series, the Avansee Preload1P Toric Clear (Kowa Co Ltd) was implanted using a digital marking system. Its orientation was assessed with retroillumination photographs at 1 hour, 1 day, 1 week, 1 month, 3 months, and 6 months. The mean rotation at each follow-up examination and percentage of eyes with a rotation within 5° and 10° were recorded.

Seventy-two eyes were enrolled and completed the 3-month follow-up examination; data for the 6-month follow-up examination were obtained in 56 eyes. From the first postoperative to the 3-month examination, the mean arithmetic and absolute rotations were 0.58° ± 2.97° and 1.44° ± 2.65°, respectively. During this period, the rotation was 10° or less in 71 of 72 eyes (98.6%) and 5° or less in 67 of 72 eyes (93.1%). In the subgroup of 56 eyes with a 6-month follow-up, the mean arithmetic and absolute rotations were 0.95° ± 2.86° and 2.27° ± 1.96°, respectively, from the first to the last examination. During this period, the rotation was 10° or less in 100% of eyes and 5° or less in 53 of 56 eyes (94.6%).

The new toric IOL has high rotational stability. The measured values were better than the corresponding values previously reported for other toric IOLs at all times considered up to 3 months and similar to them at 6 months. It satisfies the International Organization of Standardization and American National Standards Institute requirements. [.