VEP update and question

[Sidesteps]

I posted my new VEP on my profile. It pretty well looks the same as my other one; except my latency has changed a bit in both eyes and my amplitude has flip flopped eyes. I am aware that it's possible to have axonal damage without lesions.  

While it doesn't appear that I have had ON. My waveforms are all over the place and there are distortions throughout. This is consistent with my previous VEP. There wasn't any interpretations as to the distortions. The doctor just mentioned the lack of latency and reduction in amplitude.

I'm not sure what all the symptoms are from since they are classically "ON like". I have wondered why I still have intermittent pain with movement and intermittently sharp pain behind my eye. It's concerning. Does anyone know if vision symptoms come from another area in the brain other than the optic tract?

Next question/thought: I have had quite a bit of facial pain at times as well as ear fluttering/aching. Is the pain I'm getting possibly from TN? I'm thinking outloud.

(I will also ask my doctor this next Monday.)

[Sidesteps]

Don't be nervous. I seem to be an "interesting case" as the technician put it. My waveforms are screwy as my Neuro put it. I don't think my VEP is a typical response. They will have to do some other tests to figure it out. My doctor indicated previously that I'll be referred out to a different specialist with different equipment if my VEP came back this way. She reassured me that this doctor will figure it out. I hope so. My vision is messed up. lol

@Bob, thank you AGAIN. :) I don't meditate but I've been thinking I probably should start. ;) I'll let you know what my Neuro says and the results.

[Willowwoman777]

I have no idea what you are talking about with your technical terms. I am going fo rmy first VEP July 21st. Should I be nervous? I went nearly blind for several hours one day in April (pinhole size tunnel vision) and the MRI showed a good sized lesion on the occiptal lobe of the brain. The neuro said that most likely caused it, along with subclinical ON which would affect both eyes. (I had to break down and get reading glasses after that happened

[COBOB]

There are times when high amplitude gamma activity (40Hz +) in the brain can interfere with the VEP wave form.  This is a common interference in people that practice forms of meditation.  An EEG can usually rule this out as a cause.

There are really only a few thing that should be able to effect the wave form quality of a VEP.  Low amplitude can be caused by macular scarring or loss of axons in the optic nerve.  Latency is caused by lesions on the nerve.  The typical cause for additive "noise" is high amplitude gamma activity.

"The human gamma oscillatory response mediating in cortical visual information processing further proved independent of the VEPs. It can contribute to VEP waveform distortion, and its observation in substitution of VEPs should be regarded as an indication of impaired visual pathway function."

Invest Ophthalmol Vis Sci. 2007 Oct;48(10):4534-41.
http://www.iovs.org/content/48/10/4534.full.pdf


Bob

[supermum_ms]

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