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Astigmatic equivalence of 2.2-mm and 1.8-mm superior clear corneal cataract incision
Jean-Luc Febbraro1, Li Wang, Edmondo Borasio
1Rothschild Foundation, 25 rue Manin, 75019, Paris, France, jlfebbraro@fo-rothschild.fr.
Purpose:
To evaluate the astigmatic effects of 2.2-mm and 1.8-mm cataract incisions.
Methods:
A randomized prospective study of 190 eyes of 151 patients undergoing superior clear corneal incision (SCCI) was divided into three groups: 61 eyes with a control 3.2-mm SCCI; 66 eyes with a 2.2-mm SCCI; and 63 eyes with a 1.8-mm SCCI. The corneal astigmatism was measured with an autokeratometer preoperatively and 1 month after surgery. The with-the-wound (WTW), against the-wound (ATW), and WTW-ATW changes were calculated using the Holladay-Cravy-Koch formula.
Results:
The WTW, ATW, and WTW-ATW changes were significantly higher for the control 3.2-mm SCCI than for the 2.2- and 1.8-mm SCCI (all p < 0.001), and no difference was found between the 2.2- and 1.8-mm SCCI incision groups.
Conclusion:
In our study, the astigmatic effects were the same for the 2.2 mm and 1.8 mm incisions and as expected, were significantly lower than the control 3.2 mm incision group.
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