What are the normal ranges for a VEP test and readings supposed to be same both eyes?

The normal ranges for a visual evoked potential (VEP) test vary depending on the specific parameters being measured. Some of the key parameters and their typical normal ranges include:

P100 latency: This measures the time it takes for the first major positive peak (P100) of the VEP waveform to occur. Normal P100 latencies typically range from 90 to 110 milliseconds (ms) for adults and may vary slightly with age and testing conditions.

N75 latency: This measures the time it takes for the first major negative peak (N75) of the VEP waveform to occur. Normal N75 latencies typically range from 70 to 90 ms in adults.

P100 amplitude: This measures the height of the P100 peak relative to the baseline. Normal P100 amplitudes typically range from 5 to 15 microvolts (μV).

Interocular latency difference: This measures the difference in P100 latency between the two eyes. Normal interocular latency differences are typically less than 5 ms.

It's essential to note that the exact normal ranges for VEP test results may vary slightly between different laboratories and testing protocols. Therefore, it's important to refer to the specific reference values provided by the testing facility or healthcare professional interpreting the results.

While it's common for VEP readings to be similar between the two eyes, slight differences between the eyes may occur in some individuals. The healthcare professional conducting the VEP test can evaluate and interpret any significant differences in the VEP results between the eyes in the context of the patient's overall clinical presentation and medical history.