Detection of Changes in Surgical Difficulty: Evidence From Pupil Responses

Area of Science:

• Surgical Simulation and Performance Analysis
• Human Factors in Medicine
• Ophthalmology and Visual Science

Background:

• Assessing surgeon workload necessitates non-intrusive monitoring technologies.
• Investigating eye-tracking feasibility for evaluating surgeon response to task difficulty.

Purpose of the Study:

• To determine if eye-tracking can identify surgeon workload variations during simulated surgical tasks.
• To correlate pupillary responses with task difficulty in laparoscopic surgery.

Main Methods:

• Controlled study in a simulated operating room with 14 subjects performing a 9-subtask laparoscopic procedure.
• Task difficulty quantified using Fitts' index of difficulty (ID).
• Pupillary responses recorded using Tobii eye-tracking, comparing peak pupil dilation and movement time across different task difficulties.

Main Results:

• Increased task difficulty correlated with longer completion times and larger peak pupil sizes.
• Pupil responses were influenced by the current subtask's difficulty and preceding/succeeding subtasks.
• Eye-tracking data revealed distinct responses to varying levels of task difficulty.

Conclusions:

• Decomposing surgical procedures and analyzing pupil responses can pinpoint challenging subtasks.
• Pupil dilation serves as a quantifiable indicator of surgeon cognitive load and task difficulty.
• This psychomotor evidence can inform the development of specialized surgical training curricula.