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Updated: Jul 20, 2026

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Objective Nociceptive Assessment in Ventilated ICU Patients: A Feasibility Study Using Pupillometry and the Nociceptive Flexion Reflex
Published on: July 4, 2018
An electronic device to record consensual reflex in human pupil
H M Pinheiro1, R M Costa1, E N R Camilo2
1Instituto de Informática, Universidade Federal de Goiás, Goiás, Brasil.
Studies in Health Technology and Informatics
|August 12, 2015
Summary
This study introduces a new portable device and method for testing the consensual pupillary reflex, even in complete darkness. The results show this innovative approach successfully records pupillary responses to various stimuli.
Area of Science:
- Ophthalmology
- Neuroscience
- Biomedical Engineering
Background:
- Pupil examination provides objective assessment of visual function and autonomic pathways to the eye.
- Current methods for evaluating pupillary reflexes may lack portability or effectiveness in varied light conditions.
Purpose of the Study:
- To develop an effective method and a portable device for testing the consensual pupillary reflex.
- To enable objective evaluation of visual and autonomic pathways via pupillary response.
- To assess the device's efficacy under conditions of complete light blockage.
Main Methods:
- Development of a novel portable device for pupillary reflex measurement.
- Implementation of a new methodology to record the consensual pupillary reflex.
- Testing with various stimuli in a controlled, light-deprived environment.
Main Results:
- Successful construction and validation of the new portable device.
- Demonstrated efficacy in recording the consensual pupillary reflex.
- Effective performance of the methodology even in complete light blockage.
Conclusions:
- The developed portable device and methodology offer a successful approach for assessing the consensual pupillary reflex.
- This innovation allows for objective evaluation of visual and autonomic pathways.
- The system is effective even under challenging conditions, such as complete darkness.

