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Vector analysis of induced astigmatism after 2.2 mm and 2.6 mm incisions for cataract surgery

Poster Details

First Author: P.Jeppesen DENMARK

Co Author(s):    T. Olsen              

Abstract Details


To compare the induced corneal astigmatism after 2.2 mm superior corneal and 2.2 mm and 2.6 mm superior scleral incision phacoemulsification cataract surgery


Dept. of Ophthalmology, Aarhus University Hospital, Denmark


Three groups of patients had pre- and postoperative keratometry measurements using an automated keratometer (Nidek Tonoref II). K-readings were performed preoperatively and between the fifth and seventh day postoperatively. The K-readings were transformed to corneal power and preoperative astigmatism (Cpre) and postoperative astigmatism (Cpost). The induced astigmatism was calculated by simple subtraction (Csubtraction) and by vector analysis (Cdelta). The percentage of with-the-rule induced astigmatism (WTR) and against-the-rule (ATR) was calculated. All patients had uncomplicated surgery by the same surgeon. All statistics were performed using non-parametric tests


No significant difference was found for age, Cpre, Cpost or Csubtraction among the three groups. A significant difference was found among the vector calculated induced cylinder showing a lesser vector of astigmatism in using a 2.2 mm scleral incision as compared to a 2.6 mm sclera incision and a 2.2 mm corneal incision (C delta 0.70, 0.81, 1,01, respectively, p<0.001)


A detailed analysis using vector decomposition showed that a significant lesser vector of astigmatism is induced using a 2.2 mm scleral superior incision as compared to a 2.6 mm superior scleral incision or a 2.2 corneal superior incision FINANCIAL DISCLOSURE?: No

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