The VER/VEP test measures the brain’s electrical activity in response to visual stimuli, such as flashing lights or patterned images.

• Visual Evoked Potential (VEP): The electrical signals recorded from the brain when the eyes are stimulated by visual input.
• Visual Evoked Response (VER): Another term often used interchangeably with VEP.

This test helps determine if there are problems with the optic nerves or visual pathways that carry signals from your eyes to your brain.

Doctors may recommend a VER/VEP test to:

• Diagnose optic neuritis (inflammation of the optic nerve)
• Detect multiple sclerosis (MS) in early stages
• Evaluate unexplained vision loss
• Check for optic nerve damage after trauma
• Assess visual development in children
• Monitor glaucoma or other eye conditions affecting nerve function

📊 Fact: Studies show that VEP testing can detect optic nerve dysfunction even before symptoms of vision loss appear.

The Process

Preparation

Electrodes are placed on your scalp (similar to an EEG).

You’ll sit in front of a screen displaying checkerboard patterns or flashing lights.

Stimulation

The patterns or flashes stimulate your visual system.

The electrodes record how quickly and effectively your brain responds.

Analysis

The recorded signals are analyzed to see if they fall within normal response times.

Delayed or weak responses may indicate nerve damage or disease.

• Duration: Usually 30–45 minutes
• Discomfort: None—it's painless and non-invasive
• Preparation: No special preparation needed, but avoid heavy makeup or hair oils (as electrodes need to stick to the skin)
• Safety: Completely safe, with no side effects

💡 Tip: Bring your glasses or contact lenses if you use them, since clear vision ensures accurate results.