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Effect of corneal biomechanical properties on surgically induced astigmatism and high order aberrations after cataract surgery In patients with low astigmatism

Poster Details

First Author: B.Bostanci Ceran TURKEY

Co Author(s):    M. Koc   C. Ilhan   B. Ozturk   P. Yilmazbas     

Abstract Details


To evaluate effects of corneal biomechanical properties on surgically induced astigmatism (SIA) and high order aberrations (HOA) after cataract surgery in patients with low astigmatism


Ulucanlar Eye Training and Research Hospital, Ankara, Turkey


Patients having cataract surgery with 2.8 mm superior incisions were recruited. Refraction, slit-lamp and fundus examination, evaluation of HOAs and biomechanical analysis were performed in preoperative, 1st and 3rd months exams. SIA and HOAs were calculated by vector method.


Nineteen eyes of 19 patients were included. Preoperative corneal hysteresis(CH) was 8.68±1.86mmHg, and corneal resistance factor(CRF) was 8.66±1.61mmHg. In postoperative 1 month there were significant changes in total Root Mean Square(RMS)(p=0.050), HoRMS(p=0.023), astigmatism(p=0.020) and trefoil(p=0.033). Difference in coma(p=0.386) and SA was insignificant(p=0.947). In 3rd month, the only significant change was in total RMS(p=0.020) and HoRMS(p=0.012). There was no relation between preoperative CH and CRF and 1st and 3rd month postoperative total RMS, HoRMS, astigmatism, coma, trefoil and SIA. While there was no relation between CH and SA in 1st month, a positive correlation was observed in 3rd month.


Premium IOL implantation necessitates high-anticipated postoperative refractive results, but even under ideal circumstances, unexpected refractive deviations may be observed. We did not find a relationship between postoperative SIA and HOAs and preoperative CH and CRF. There was only a positive correlation between the 1st month SA and CH but there was no significant increase in postoperative SA change. As a result, clinically this correlation may not be critically important. Further studies with larger patient groups are needed since relationship between corneal biomechanical properties and SIA and HOA may assist for understanding the unexpected results after cataract surgery.

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