VEP examination with new portable device

Area of Science:

• Neuroscience
• Ophthalmology
• Biomedical Engineering

Background:

• Visual evoked potentials (VEPs) are objective, noninvasive measures for diagnosing visual and central nervous system dysfunctions.
• Current VEP examination is often confined to specialized laboratories, limiting accessibility.
• There is a need for portable, user-friendly VEP systems for broader clinical application.

Purpose of the Study:

• To develop and validate a new portable device, VEPpeak, for simplified VEP examinations.
• To extend VEP testing capabilities beyond traditional electrophysiological settings.
• To provide a low-cost, noninvasive diagnostic tool for visual and neurological conditions.

Main Methods:

• Developed VEPpeak, a 390g portable headset with integrated EEG amplifiers, A/D converter, control unit, and LED stimulator.
• Utilized custom PC/notebook software for stimulus generation, VEP recording, and processing via USB.
• Conducted feasibility and validation studies with 86 healthy subjects and 76 neuro-ophthalmological patients, comparing with a conventional VEP system.

Main Results:

• VEPpeak demonstrated robust and repeatable recordings for standard and non-standard VEP protocols, even in immobilized patients.
• Results showed good comparability between VEPpeak and conventional VEP examinations.
• Observed systematic differences in peak latencies and amplitudes, attributed to stimulus characteristic variations.

Conclusions:

• VEPpeak offers an inexpensive, portable solution for clinical VEP assessment.
• The device's flexibility in stimuli and bio-signal recording makes it versatile for various electrophysiological applications.
• VEPpeak facilitates wider adoption of VEP testing for diagnosing visual and central nervous system dysfunctions.