Visual evoked potentials by different check sizes in patients with multiple sclerosis.

Area of Science:

• Ophthalmology
• Neuroscience
• Clinical Electrophysiology

Background:

• Visual evoked potentials (VEPs) are crucial for assessing visual pathway function.
• Standardized VEP testing protocols are essential for accurate diagnosis.
• Variations in stimulus parameters can influence VEP results.

Purpose of the Study:

• To evaluate the diagnostic sensitivity of different check sizes in visual evoked potentials (VEPs).
• To determine the optimal combination of check sizes for detecting visual pathway abnormalities.
• To assess the impact of check size on P100 latency measurements.

Main Methods:

• VEPs were recorded from 1,006 patients and 20 controls using 25', 50', and 100' arc check sizes.
• Abnormalities and P100 latency were analyzed across different check sizes.
• The sensitivity of combined check sizes was compared to individual sizes.

Main Results:

• VEP testing identified abnormalities in 270 patients irrespective of check size.
• Fifty-three patients showed prolonged P100 latency only with specific check sizes.
• Combined 25' and 100' checks demonstrated the highest sensitivity, while 50' checks alone were least sensitive.
• Alternative check sizes resolved ambiguous W-shaped responses, aiding peak selection for latency determination.

Conclusions:

• The choice of check size significantly impacts VEP test sensitivity for visual pathway disorders.
• A combined approach using 25' and 100' checks enhances diagnostic accuracy.
• Optimizing VEP parameters, including check size, is vital for reliable clinical interpretation.