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The change in posterior corneal astigmatism after combined femtosecond-assisted phacoemulsification and arcuate keratotomy

Poster Details

First Author: W.Whang SOUTH KOREA

Co Author(s):    M. Choi   M. Kang   J. Lee   C. Joo           

Abstract Details

Purpose:

To analyze surgically-induced astigmatism (SIA) on the posterior cornea and on the toal cornea determined using an automated keratometer and a Scheimpflug rotating camera after combined femtosecond-assisted phacoemulsification and arcuate keratotomy.

Setting:

Seoul St. Mary hospital, Seoul, South Korea.

Methods:

The study included 90 left eyes of 90 patients who had undergone combined femtosecond-assisted phacoemulsification and arcuate keratotomy. Following phacoemulsification, the intraocular lens was inserted into the bag through a 2.2-mm micro-coaxial incision. Refractive outcomes and keratometric measurements were measured 3 months post-operatively. Corneal astigmatism was measured by automated keraometer and a Scheimpflug rotating camera. Total corneal asigmatism was calculated by ray-tracing method. SIA was analyzed using the vector method and an aggregate analysis of astigmatism based on the vector method.

Results:

The SIAs determined by automated keratometry and Pentacam anterior K were 0.98 and 1.02 diopter, respectively, while the SIA on the posterior cornea was 0.41 diopter. The SIA determined using the TCRP 3.0-mm zone was the greatest (1.22 diopter), followed by the SIA determined according to TCRP 3.0-mm ring, TCRP 4.0-mm zone, TCRP 3.0-mm ring, and TCRP 4.0-mm ring. The SIA on the total cornea was significantly greater than the SIA on the anterior cornea (all p < 0.05).

Conclusions:

SIA on the posterior cornea is not negligible after combined femtosecond-assisted phacoemulsification and arcuate keratotomy and SIA on the cornea as a whole was significantly greater than SIA of the anterior cornea. The modification of nomogram considering the posterior cornea will facilitate reduction of postoperative refractive cylinder.

Financial Disclosure:

NONE

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