Abstract
Purpose :
To observe the safety, efficacy, predictability and stability of LenSx femtosecond laser-assisted corneal keratotomy for correction of low or moderate corneal astigmatism in intraocular collamer lens (ICL)
Methods :
60 patients with low or moderate corneal astigmatism (≤1.50D) were divided into TICL group, AK group (AK+ICL) and femtosecond group (LenSx femtosecond+ICL), and 20 patients in each group. The Target-Induced Astigmatism(TIA) of the three groups were 1.12±0.34,1.09±0.27, 1.13±0.38,respectively (P>0.05). At 1 week and 1,3,6 months after surgery, uncorrected distance visual acuity (UCDVA), difference vector (DV) and surgically-induced astigmatism (SIA) were measured, and astigmatism correction index (CI) was calculated from TIA and SIA. The complications were observed at 6 months after surgery.
Results :
Three groups of data were compared in pairs. There was no significant difference in UCDVA between femtosecond group and AK group at 1 week and 1 month postoperatively (P>0.05), in 3,6 months femtosecond group was higher than AK group (P<0.05). The DV of femtosecond group was lower than that of AK group at 1 week and 1,3,6 months postoperatively, but the SIA was higher than that of AK group (P<0.05). Compared with TICL group, the DV and SIA of femtosecond group had no significant difference (P>0.05). CI at different time points after operation showed that, femtosecond group was 0.78±0.36,0.79±0.33,0.77±0.35, 0.78±0.34,respectively, and AK group was 0.57±0.26,0.58±0.23,0.54±0.25,0. 51±0.24, respectively. TICL group was 0.81±0.32,0.80±0.33,0.78±0.31,0.78±0.28. Femtosecond group was higher than AK group (P<0.05), but there was no significant difference compared with TICL group(P>0.05). Observation of the ICL rotation showed that patients with axial deviation degree < 5 °, 5-10 °, were 16, 4cases respectively.
Conclusions :
Compared with manual keratotomy, femtosecond laser assisted-corneal keratotomy showed an excellent efficacy for correction of low or moderate corneal astigmatism during ICL surgery. Compared with the traditional astigmatism ICL, it can achieve similar clinical effect and avoid the problems of axial deviation and long waiting time. This study provides a safe and effective treatment for ICL patients with low or moderate corneal astigmatism.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.