ESCRS - FP29.01 - Correction Of Corneal Astigmatism By Modified Femtosecond Laser-Assisted Arcuate Keratotomy In Femtosecond Laser-Assisted Cataract Surgery In Chinese Patients.

Correction Of Corneal Astigmatism By Modified Femtosecond Laser-Assisted Arcuate Keratotomy In Femtosecond Laser-Assisted Cataract Surgery In Chinese Patients.

Published 2023 - 41st Congress of the ESCRS

Reference: FP29.01 | Type: Free paper | DOI: 10.82333/pdr8-e883

Authors: Shaowei Li* 1 , Xue Ding 2 , Fan Zhang 3 , Chenxi Hu 2 , Daguang Bi 2

1Aier School of Ophthalmology,Central South University,Changsha,China;Beijing Aier-Intech Eye Hospital,Beijing,China, 2Beijing Aier-Intech Eye Hospital,Beijing,China, 3Aier School of Ophthalmology,Central South University,Changsha,China

Purpose

To evaluate the astigmatism correcting effect of modified
femtosecond laser-assisted arcuate keratotomy (FSAK) during femtosecond laser-assisted cataract surgery (FLACS) in Chinese people.

Setting

Retrospective case series.

Methods

The study included patients who underwent combined FSAK and FLACS, with corneal astigmatism of 0.5 to 2.5 diopters (D). A total of 77 eyes of 66 patients were enrolled. FSAKs were created at 8.7 mm optical zone at 90% depth. Alpins vector analyses of astigmatism were performed, considering three vectors: target-induced astigmatism (TIA), surgically induced astigmatism (SIA), and difference vector (DV). Magnitude of error (ME)(difference between SIA and TIA) , angle of error (AE), correction index (CI)(ratio of SIA and TIA), and coefficient of adjustment (CA)(inverse of the CI)  were calculated. Corneal astigmatism was measured before and 3 months after surgery. Subgroup analysis according to the axis of astigmatism was conducted.

Results

The corneal astigmatism was significantly reduced from 1.30±0.37 D to 0.70±0.48 D (P<0.001). The TIA was 1.32±0.38 D, the SIA was 1.21±0.75D, and the DV was 0.75±0.58 D. The ME was -0.11±0.68 D, and the CI was 0.93±0.49. The CA was 1.51±1.09. The AE was 2.58° ± 20.8°. The corneal astigmatism decreased significantly in all axes of astigmatism (P<0.001 in with-the-rule (WTR) and against-the-rule (ATR) group, P =0.012 in oblique astigmatism (OBL) group). The magnitudes of residual astigmatism were 0.78±0.44 D in WTR, 0.64±0.54 D in ATR, and 0.53±0.39 D in OBL postoperatively. The CI were 0.67±0.36, 1.25±0.48 and 1.03±0.41 in WTR, ATR and OBL respectively, which demonstrated it was slightly undercorrected in WTR and overcorrected in ATR group. 

Conclusions

Modified FSAK for Chinese cataract patients could reduce postoperative corneal astigmatism effectively and safely.