Study Of Surgically Induced Astigmatism After Laser In Situ Keratomileusis In Myopes
Published 2022 - 40th Congress of the ESCRS
Reference: FPT03.01 | Type: Free paper | DOI: 10.82333/qsyy-db18
Authors: Aprajita Sinha* 1 , Radhika Acharya 2 , Jayeeta Bose 3
1Ophthalmology,Worcestershire Acute Hospitals NHS Trust,Worcester,United Kingdom, 2Medical Student,University of Birmingham Medical ,Birmingham,United Kingdom, 3Ophthalmology,EyeQ Hospitals,Gurgaon,India
Purpose
To evaluate the surgically induced astigmatism (SIA) after laser in situ keratomileusis (LASIK) in myopes.
Setting
This prospective observational study was conducted in a teaching eye hospital in New Delhi, India.
Methods
Refractive outcomes in 48 eyes that underwent myopic LASIK from December 2017 to December 2018 were analysed in this prospective observational study. The enrolled patients had myopia upto 10 D with or without astigmatism upto 1 D. All flaps were nasally hinged. The patients were followed up till 3 months after surgery. The SIA was calculated and was correlated with the type and amount of preoperative refractive error, keratometric power, ablation depth and refractive and corneal astigmatism.
Results
The mean SIA was found to be 0.45 ± 0.33 D using vector analysis. SIA showed a positive correlation with increasing grades of myopia (p = 0.019). SIA was higher in spherocylinders (0.5 ± 0.34 D) as compared to pure spherical errors (0.32 ± 0.26 D). On univariate regression, spherical equivalent (p = 0.03), ablation depth (p = 0.001), preoperative refractive astigmatism (p = .04), preoperative corneal astigmatism (p = 0.0002) and steep K (p = 0.04) remained the significant predictors of SIA. On multivariate regression, preoperative corneal astigmatism (p = 0.01) was found to be the single most important predictor of SIA.
Conclusions