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Thanks for the reply and the links. I've searched quite a bit and can't find a VEP with results similar to mine. There doesn't seem to be one where the P100 was not identified at all, at least not one that I can find online. At this point, my regular eye doctor, my neurologist and my neurosurgeon have looked at the VEP results but haven't given me any useful information. The neurosurgeon apparently doesn't think the cyst is responsible for it, the neurologist doesn't think it's related to my neuralgias, and the regular eye doctor just seemed relieved to pass me on to the neuro-ophthalmologist who I'm seeing in June. That appointment is over a month away and my follow-up brain MRI is toward the end of July, so I'm anxious and frustrated.