[Infrared pupilometry measured by digital photography]

Area of Science:

• Ophthalmology
• Neuroscience
• Biomedical Engineering

Context:

• Pupil size regulation involves parasympathetic and sympathetic nervous systems.
• Accurate pupil size measurement is crucial in clinical and experimental research.
• Existing methods may have limitations in precision and accessibility.

Purpose:

• To develop and validate a cost-effective infrared pupilometry technique.
• To establish a precise method for measuring pupil diameter using digital photography and software.
• To assess the method's sensitivity and applicability in pharmacological studies.

Summary:

• An infrared pupilometry method was developed using a digital camera and custom software.
• The formula D(mm)=30/S(pix)*D(pix) was used for pupil diameter calculation.
• Validation showed less than 3% deviation from calibration circles and <5% difference from a commercial pupillometer.
• The method demonstrated applicability in assessing tramadol's pharmacodynamic effects.

Impact:

• Provides a precise and sensitive tool for pupil size determination.
• Offers a potentially more accessible and affordable alternative for pupil measurement.
• Facilitates research in ophthalmology, neuroscience, and pharmacology.
• Enhances the ability to study the effects of drugs and physiological changes on pupil dynamics.