Posters
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
