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Surgically induced anterior, posterior, and total corneal astigmatism

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Session Details

Session Title: Corneal Astigmatism Assessment. Surgery Equipment

Session Date/Time: Saturday 05/09/2015 | 11:00-13:00

Paper Time: 12:04

Venue: Main Auditorium

First Author: : P.Jeppesen DENMARK

Co Author(s): :    J. Pedersen   T. Olsen   K. Naeser              

Abstract Details


To evaluate the surgically induced astigmatism (SIA) from the anterior and posterior corneal surfaces after phacoemulsification through superior scleral incisions.


Dept. of Ophthalmology, Aarhus University Hospital, Denmark


Eighty eyes from 51 patients were measured with Nidek autorefractor and Pentacam preoperatively and one month postoperatively. All patients were operated using a 2.2 mm superior scleral incision. They were divided into with with-the-rule astigmatism (WTR) (36 eyes) and with against-the-rule astigmatism (ATR) (38 eyes). SIA was calculated from three methods. A) Using the K-readings from the Nidek autorefractor. B) Using the Pentacam K readings from the anterior and posterior corneal surface in a thick lens formula. C) Using the total refractive power from the Pentacam. The astigmatism was separate into polar values in 90 and 135 degrees.


The average SIA for the ATR group in polar values [D] (KP90,KP135, method) was (-0.05,-0.11, A), (-0.15, -0.13, B), and (-0.20, -0.13, C) and for the WTR group it was (-0.21, -0.11, A), (-0.08, -0.23, B), and (0.07, -0.17, C). No significant difference was found between the three sets of data for the group of ATR using polar values 90 (p=0.68) and 135 (p=0.99) or for the group of WTR using polar values 90 (p=0.10) and 135 (p=0.69)


A small scleral incision induced minimal astigmatism irrespectively of the three different methods to measure the SIA.

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