Visual Evoked Potential

Question 1

The P100 is considered abnormally prolonged if > ___?

Answer 1

112 ms

Question 2

What is the interocular P100 difference that would be considered abnormal?

Answer 2

> 6 ms

Question 3

What difference in P100 amplitudes would be considered abnormal?

Answer 3

> 50 % difference with the lower amplitude being abnormal

Question 4

Where is the lesion localized with one P100 prolonged?

Answer 4

Anterior to the optic chiasm

Question 5

Where is the lesion localized if both P100s are prononged

Answer 5

It can’t be localized

• It could be bilateral lesions anterior or posterior to the optic chiasm
• It could be one unilateral lesion posterior to the optic chiasm