Intrastromal Arcuate Keratotomy With Femtosecond Laser for Cataract Surgery
Narrative Responses:
Purpose
To evaluate the efficacy of intrastromal arcuate incisions created by femtosecond laser for astigmatic correction in patients undergoing cataract surgery. This study is designed to assist in the development of a nomogram for astigmatic correction using intrastromal arcuate incisions done with femtosecond laser.
Methods
A prospective study of 50 cataract patients with pre-operative astigmatism of 0.5D to 3D was conducted. Pre-operatively, astigmatism was assessed with corneal topography and manual/IOL Master keratometry. Astigmatic correction was calculated using the Donnenfeld nomogram for limbal relaxing incisions. Arcuate incisions were placed at an optical zone of 8mm with a side cut angle of 90 degrees with uncut anterior and posterior regions of 20% of corneal thickness. Capsulotomy, fragmentation, and ISAK were performed with femtosecond laser (Catalys), followed by standard cataract extraction. Astigmatic correction was evaluated at post-operative months 1 and 6 with refraction, topography, and manual/IOL Master keratometry.
Results
To date, patients enrolled have had intrastromal arcuate incisions without adverse events and demonstrate reduction of preoperative astigmatism. Final statistical outcomes are in process and will be available by the presentation.
Conclusion
ISAK presents the potential benefits of minimizing risk of infection and increasing patient comfort, particularly related to foreign body sensation. Preliminary results will show the effectiveness of our astigmatic protocol. Final results will help contribute to the development of a nomogram for astigmatic correction with the femtosecond laser using ISAK.