To study corneal changes after endocapsular phacoemulsification cataract extraction and intraccular lens (IOL) implantation with a 3.5 mm clear corneal sutureless incision or a 5.0 mm clear corneal incision with an absorbable suture.
Northwest Kansas Eye Clinic, Hays, Kansas, USA.
In a prospective study, 200 eyes were randomly distributed into two groups. Group A comprised 100 eyes that had a silicone IOL inserted through a 3.5 mm sutureless clear corneal incision. Group B comprised 100 eyes that had a 5.0 mm poly(methyl methacrylate) (PMMA) IOL inserted through a 5.0 mm clear corneal incision; one half of the closures used a single radial suture (Group B,) and the other half, an X suture (Group B2
). Preoperatively, corneal topography and corneal endothelial cell counts were performed. Six to 8 months postoperatively, they were repeated and evaluated. Differential topography was used to determine the difference between the preoperative and postoperative corneas. During the final postoperative visit, IOL centration was evaluated.
All closures produced only minimal changes in the corneal topographic indices. The postoperative corneas closely resembled the preoperative corneas. Polar K values showed a slight astigmatic shift in all groups. Group 132 was the only one to exhibit a with-the-rule shift. The change in endothelial cell counts was minimal and comparable in all three groups.
The small amount of change in the corneal indices, especially in surface regularity, indicates that all corneas were relatively comparable and stable 6 to 9 months postoperatively regardless of the type of incision and closure method.