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Surgically-induced corneal astigmatism after phacoemulsification: impact of the wound size
Session Title: Corneal Incisions and preloaded IOLs
Session Date/Time: Sunday 06/10/2013 | 08:00-09:30
Paper Time: 08:28
Venue: Elicium 2 (First Floor)
First Author: : I.Knezovic CROATIA
Co Author(s): : M. Belovari Visnjic J. Salopek Rabatic R. Kasalica Zuzul
To evaluate surgically induced astigmatism (SIA) after phacoemulsification performed with self-healing clear corneal incisions of 2,75 mm and 2,20 mm wound sizes.
Knezovic vision group, Zagreb, Croatia
Sixty five eyes of forty patients were included in prospective study which was conducted from July 2012 to January 2013. The study included 42% of men and 58% of women. The mean patient age was 71.34±6.23 years. None of the patients had a history of previous ocular surgery, or disease that affect corneal refraction. Patients were randomly divided in two groups: first group with corneal incision of 2,75 mm (n = 32) and second group with corneal incision of 2,2 mm (n = 33). All patients received cataract surgery from a single surgeon on Alcon Infiniti device and foldable acrylic single piece intraocular lenses (IOL) (Acrysof SA60AT or SN60WF) were implanted. Scheimpflug topography (Oculyzer, Wavelight) was performed preoperatively and during follow up examinations postoperatively at seven days, four weeks and three months. SIA was calculated by using vector analysis (Alpins method).
During follow up period, there were no postoperative complications like intraocular pressure disturbances, wound leakage and infection. Preoperative astigmatism was 0,74 ± 0,43 diopter (D) in 2,75 mm incision group, and 0,86 ± 0,56 D in 2,2 mm incision group. The mean values of postoperative astigmatism in 2,2 mm incision group were smaller than in 2,75 mm incision group. Mean SIAs of both groups were between 0,19 Diopter (D) and 1,25 D in the entire observational periods.
Mean SIA of the anterior corneal surface measured by curvature and elevating topography on Oculyzer was larger in the 2,75 mm than in 2,2 mm incision group.