Posters
Corneal astigmatic changes after arcuate keratotomies with femtosecond laser in patients with cataract
Poster Details
First Author: P. Papadopoulos GREECE
Co Author(s): K. Athanasiou A. Papadopoulos G. Boukis C. Kakoulidis A. Cernak
Abstract Details
Purpose:
To determine corneal astigmatic changes by vector analysis after astigmatic keratotomies (AK) with femtosecond laser in eyes that underwent cataract surgery
Setting:
1- Athens Metropolitan Hospital 2-Ophthalmo-Check Eye Center, Athens 3-Ophthalmology Dept, Slovak Medical University
Methods:
Twenty-six eyes of 18 patients were included. Corneal curvature measurements, calculations for the target induced astigmatism (TIA), axis and arc length of astigmatic keratotomies were made with Verion Image Guided System (Alcon Laboratories, Inc., Fort Worth, TX), using the default nomograms. All AKs were performed with the LenSx femtolaser. All patients had postoperative examinations the first day, the first week and at 4 to 12 weeks. The data were evaluated using the Alpins vector method, based on fundamental vectors (target induced astigmatism (TIA), surgically induced astigmatism (SIA), and difference vector (DV).
Results:
Postoperatively, the mean magnitude of the SIA vector (0.79 D ± 0.65 [SD]) was lower than the mean magnitude of TIA vector (1.08 D ± 0.64 [SD]) at the last postop exams. The mean difference vector, the mean magnitude of error, the mean angle of error (AE) and the mean correction index were, 0.95 D ± 0.46 (DV), -0.28 (ME), -11o(AE) and 0.86 (CI), respectively. Other parameters measured, were mean index of success (IOS): 1.12, mean coefficient of adjustment (COA): 2.14 and flattening index (FI): 0.54. All these findings indicate undercorrection of intended astigmatism.
Conclusions:
Arcuate keratotomies created with Femtosecond laser can decrease preoperative astigmatism in cataract patients. However, undercorrections are frequent, necessitating the adjustment of current nomograms.
Financial Disclosure:
NONE
