Correlation Between Change In Biomechanical Parameters And Corneal Thickness After Smile And Lasik
Published 2023 - 41st Congress of the ESCRS
Reference: FP11.06 | Type: Free paper | DOI: 10.82333/2mw5-0n98
Authors: Jeewan S Titiyal* 1 , Vimal Vashistha 1 , Manpreet Kaur 1 , Sridevi Nair 1
1RP Centre for Ophthalmic Sciences,All India Institute of Medical Sciences,New Delhi,India
Purpose
To correlate the change in biomechanical parameters (Corvis-ST) with corneal thickness after myopic SMILE and LASIK.
Setting
Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
Methods
Prospective interventional study enrolled 100 eyes undergoing myopic LASIK (n=50) or SMILE (n=50). Change in corneal biomechanical parameters and its correlation with change in pachymetry was assessed at 6 months.
Results
Biomechanical parameters were comparable after LASIK and SMILE at 6 months. Change in pachymetry was higher in SMILE (p=0.01) and correlated significantly with change in deformation amplitude (r=-0.16,-0.53;p=0.04,0.01), deformation amplitude ratio (r=-0.43,-0.51;p=0.02,0.01), integrated radius (r=-0.63,-0.63; p<0.001,0.001), stiffness parameter-A1(r=0.55,0.53;p=0.003,0.01) and bIOP(r=0.68,0.72;p=0.001,0.001) in both groups. Change in stress strain index (SSI) did not correlate with change in pachymetry.
Conclusions
Biomechanical outcomes after SMILE and LASIK were comparable. SSI was the only parameter that did not correlate with change in pachymetry highlighting its potential to predict corneal biomechanics independent of corneal thickness.