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Comparison of astigmatism correction between anterior penetrating and intrastromal arcuate incisions in eyes undergoing femtosecond laser-assisted cataract surgery

Poster Details

First Author: S.Brar INDIA

Co Author(s):    S. Ganesh                    

Abstract Details


To compare the safety, efficacy and predictability of femtosecond enabled anterior penetrating and intrastromal corneal incision for the correction of pre-operative astigmatism at the time of cataract surgery


Nethradhama Eye Hospital, Bangalore


This prospective, randomized, comparative study included 43 eyes from 43 patients who underwent femtolaser assisted cataract surgery with the Catalys Precision System, of which 23 eyes received anterior penetrating and 20 eyes received intrastromal arcuate incisions for correction of corneal astigmatism in the range of 0.75 to 2 D of astigmatism. Follow-up was conducted at 1 week, 1 month and 6 months post-op. Vector analysis of astigmatism was performed using the Alpins method with ASSORT software.


The mean pre-operative keratometric astigmatism and Target Induced Astigmatism(TIA) were 0.93 D and 1.28 D in the AP group and 0.90 D and 0.93 D in IS group respectively. There was no statistically significant difference between the post-operative keratometric astigmatism (AP=0.59, IS=0.78, P-value=0.1) and Surgically Induced Astigmatism(SIA)(AP=0.77, IS=0.67, P-Value=0.42) at 6 months post-op.Both groups demonstrated undercorrection shown by a comparable Correction Index(CI) of 0.72 and 0.67(p-value=0.69),although the IS group showed more undercorrection. Index of success(IOS) was also comparable( AP=0.31, IS=0.32, P-value=0.82).90% eyes in IS and 73% eyes in AP group were within �Â�±0.5 D of astigmatism


Both anterior penetrating and intrastromal incisions were safe and effective and demonstrated good predictability for astigmatism correction using femtolaser technology.However, both incisions showed undercorrection with time, which was more evident in the intrastromal group

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