Purpose:

To validate astigmatism correction outcomes of novel femtosecond laser (FSL) assisted capsular marks for toric IOL alignment along with Barrett integrated K method for toric IOL power calculations.

Methods:

This study included subjects who underwent FSL assisted cataract surgery and toric IOL implantation for the correction of pre-existing astigmatism. Corneal astigmatism was measured with Scheimpflug-derived corneal tomography and point-source color light-emitting diode (LED) topographer. Barrett integrated K method was used to determine accurate toric IOL axis and power. For cyclotorsion compensation iris-registration data were wirelessly transmitted from preoperative diagnostic device to FSL. Capsulotomy with capsular marks (Intelliaxis-L) was performed in all cases to guide toric IOL alignment precisely on the planned axis. Postoperative outcome measures were residual cylinder, UCVA, BCVA and IOL rotation.

Results:

Data are being collected. Preliminary results show significant reduction in astigmatism from 2.2 ± 1.6 D preoperatively to (range; 0.9 to 5.2 D) to 0.42 ± 0.33 D (range: 0.00 to 1.00 D). Frequency distribution analysis of post-operative refractive cylinder reveals that close to 80% of the eyes had refractive cylinder of ≤ 0.5 D/ close to 90% of the eyes had refractive cylinder of ≤ 0.75 D. Double angle vector plot revealed that postop manifest refractive astigmatism points moved closer to the origin, suggesting substantial reduction in astigmatism.

Conclusions:

Good pre-op measurements, innovative mathematical models and reliable capsule marking are key to achieving good toric IOL outcomes.