Visual evoked potential repeatability using the Diopsys NOVA LX fixed protocol in normal older adults.

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Technology

Background:

• Visual evoked potentials (VEP) are crucial for assessing the visual pathway's integrity.
• Evaluating the repeatability of VEP measurements is essential for clinical diagnosis and monitoring.
• The Diopsys NOVA LX system offers a standardized approach to VEP testing.

Purpose of the Study:

• To assess the intrasession and intersession repeatability of VEPs in adults over 40.
• To determine the reliability of the Diopsys NOVA LX fixed protocol for VEP recordings.

Main Methods:

• 46 healthy adults over 40 with good visual acuity participated.
• Three consecutive VEP examinations were performed using the Diopsys NOVA LX fixed protocol.
• Repeatability was assessed over 2-6 weeks for intersession analysis.

Main Results:

• VEP latency showed higher repeatability (CV: 3%-7%) than amplitude (CV: 21%-33%).
• High contrast stimuli resulted in better repeatability for both amplitude and latency compared to low contrast.
• Repeatability was not significantly affected by age, sex, or race.

Conclusions:

• The Diopsys NOVA LX fixed protocol demonstrates clinically acceptable repeatability for VEPs in older adults.
• Latency measurements are more repeatable than amplitude.
• High contrast stimuli enhance VEP test reliability.