Effects of strabismus surgery on static and dynamic pupillometry

Area of Science:

• Ophthalmology
• Neuroscience

Background:

• Pupil diameter is influenced by various factors, including surgical interventions.
• Ocular surgery, particularly strabismus surgery, may impact pupillary function.

Purpose of the Study:

• To evaluate the effects of strabismus surgery performed via a limbal incision on both static and dynamic pupillometry.
• To assess changes in pupil diameter following horizontal muscle recession and resection.

Main Methods:

• The study involved 32 patients undergoing strabismus surgery.
• Static and dynamic pupillometry measurements were recorded preoperatively and at 10 days, 1 month, and 3 months postoperatively.
• Measurements were taken on eyes that had undergone horizontal muscle recession and resection through a limbal incision.

Main Results:

• Postoperative scotopic pupil diameter measurements were significantly larger than preoperative measurements (p=0.0027).
• Dynamic pupillometry revealed significant differences in pupil diameter at 1 and 2 seconds postoperatively compared to preoperative values (p<0.05).
• No significant differences were observed in pupil dilation velocities between preoperative and postoperative assessments.

Conclusions:

• Strabismus surgery through a limbal incision appears to affect static and dynamic pupil size.
• The findings suggest a disruption in the balance between the parasympathetic and sympathetic nervous systems post-surgery, potentially favoring sympathetic influence.