Repeatability of short-duration transient visual evoked potentials in normal subjects.

Area of Science:

• Ophthalmology
• Neuroscience
• Biomedical Engineering

Background:

• Transient visual evoked potentials (VEPs) are crucial for assessing visual pathway function.
• Evaluating the repeatability of new VEP technologies is essential for clinical adoption.
• Short-duration VEP (SD-VEP) offers a potentially faster alternative to traditional methods.

Purpose of the Study:

• To assess the within-session and inter-session repeatability of a novel short-duration transient visual evoked potential (SD-tVEP) device.
• To evaluate the inter-eye correlation and agreement of SD-tVEP measurements.
• To determine the reliability of SD-tVEP parameters like amplitude and latency in normal subjects.

Main Methods:

• Thirty normal subjects underwent SD-tVEP testing using a checkerboard stimulus at two contrast levels (10% and 85%).
• Tests were repeated within sessions and across multiple sessions (1-2 months apart) for a subset of subjects.
• EEG was recorded, and N75 amplitude, N75 latency, P100 amplitude, P100 latency, and Delta Amplitude (N75-P100) were analyzed.

Main Results:

• The SD-tVEP device exhibited low within-session variability for all measured parameters.
• Intraclass correlation coefficients ranged from 0.64 to 0.98, indicating good to excellent repeatability.
• Bland-Altman plots demonstrated good agreement for amplitude and latency measurements between sessions and between eyes.

Conclusions:

• The short-duration transient visual evoked potential (SD-tVEP) technology demonstrates robust within-session and inter-session repeatability.
• The device shows significant inter-eye correlation and agreement, suggesting reliability for bilateral visual assessment.
• SD-tVEP is a promising tool for objective electrophysiological assessment of the visual system.