Rotational stability of the V4b implantable collamer lens

PURPOSE: To assess rotational stability from corneal and refractive astigmatism vectorial decomposition after Toric Implantable Collamer Lens (TILC) V4b model implantation. SETTING: Fernandez-Vega Ophthalmological Institute, Oviedo, Spain METHODS: Thirty-five eyes of twenty patients implanted with TICL V4b model were evaluated. Refraction and keratometry were measured in all patients preoperatively and 3, 6 and 12 months post-surgery. RESULTS: No statistically significant differences were found in corneal astigmatism vectorial decomposition (J0 and J45) between the preoperative evaluation and each postoperative visit (p > 0.05). However, statistically significant differences in refractive astigmatism vectorial decomposition (J0 and J45) were found between preoperative and postoperative measurements (p < 0.05). Refractive astigmatism vectorial decomposition remained stable in each pair of visits during the 12-month follow-up with no statistically significant differences (p > 0.05). CONCLUSIONS: These outcomes suggest high rotational stability of the TICL model V4b, with no significant rotation or axis misalignment in any eye at 12-month follow-up. In addition, no eyes required TICL repositioning in this period. SUMMARY: The Toric Implantable Collamer lens V4b model showed high rotational stability after implantation in eyes with low and high astigmatism in a vectorial decomposition analysis during a 12-month follow-up.