Effects of strabismus surgery on static and dynamic pupillometry

Many factors influence pupil diameter, including ocular surgery. The purpose of this study was to investigate the effects of strabismus surgery performed through a limbal incision on static and dynamic pupillometry.

Static and dynamic pupillometry measurements were made and compared in 32 eyes of 32 patients who were scheduled to undergo horizontal muscle recession and resection through a limbal incision in one eye preoperatively and postoperatively on 10 day and at months 1 and 3.

All postoperative scotopic pupil diameter measurements of the cases were found to be significantly higher than the preoperative scotopic pupil diameter (p = .0027). In the dynamic pupillometry analysis, a significant difference was found between preoperative and postoperative day 10 and month 1 pupil diameter values of the cases for the measurements taken at seconds 1 and 2 and (p¹=0.0033, p²=0.0039, and p⁵=0.0238). No significant difference was found between preoperative and postoperative values for dynamic pupillometry pupil dilation velocities at any evaluation point.

We believe that after strabismus surgery, the balance between the parasympathetic and sympathetic nervous systems, which determine the pupil diameter, is disrupted to the detriment of the parasympathetic nervous system.