The 2.75 mm three-plane clear corneal incision (CCI) created with a femtosecond (FS) laser produces comparable outcomes to single-plane angled manual incision for anterior and posterior corneal topography, claims a new study.

, Fondazione G.B. Bietti IRCCS, Rome, Italy, performed inflation testing in 14 human eye globes to assess the topographic response to the cornea to CCIs.

The eyes were divided into two group, with first group undergoing a 2.75 mm three-plane CCI created with an FS laser and the control group receiving a 2.75 mm manual CCI using disposable angled knives.

A Scheimpflug topographer was used to obtain topographic maps of the anterior and posterior cornea, keratometric data was used to evaluate the curvature changes of the cornea and vector analysis was used to identify the changes of corneal astigmatism.

The mean postoperative change of the anterior keratometric power was 0.04 ± 0.39 and 0.05 ± 0.51 in the FS laser and control groups, respectively and the mean change of the posterior corneal keratometric power was 0.16 ± 0.19 and 0.15 ± 0.18 D, respectively.

It was found that the average change of the anterior and posterior corneal astigmatism vector magnitude was 0.17 D or less in both groups. The team also recorded an insignificant against-the-rule astigmatic change in the anterior and posterior corneal interfaces after both CCI techniques.