This article is more than 5 years old. Information may no longer be current.
Speaker: CorT total accurately measures corneal astigmatism
BARCELONA — Corneal topographic astigmatism total power measurement may be a more accurate and consistent method of measuring corneal astigmatism than the corneal topographic astigmatism anterior power measurement, according to a speaker here.
“We thought it would be a natural thing to look at all the [Placido] rings, so if there was any irregularity in one, it is going to be ironed out by taking an average of all the rings,” Noel A. Alpins, MD, said at the European Society of Cataract and Refractive Surgeons meeting.
Noel A. Alpins
In a study published in the Journal of Refractive Surgery, Alpins and colleagues compared the corneal topographic astigmatism (CorT) anterior and CorT total.
The results showed that standard deviation of ocular residual astigmatism was 0.32 D with the CorT anterior and 0.30 D with the CorT total.
“We showed that the variability of the CorT total was better than the CorT anterior. The magnitude was lower and closer to the refractive cylinder, which is the gold standard of any astigmatism value,” he said.
The CorT total gives a reliable orientation and accurate magnitude for toric implants when clinicians are deciding which implant to use, according to Alpins.
“[The CorT] is now incorporated into the CSO Sirius, Oculus Pentacam and Ziemer Galilei tomographers,” Alpins said. – by Nhu Te
Disclosure: Alpins reports a financial interest in Assort Surgical Management System.