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ERG and Filtration Implant

Retina specialist arranged an electroretinography (EGR) at a local university.  He's trying to find why I have movement and a flame like flashing in the bad eye.  He is aware of my filtration surgery of June, 2008.  When my case was reviewed by the ERG technician, she asked her supervisors about the risk of ERG due to the filtration device.  They told her to suspend the tests.  The eye surgeon who did the filtration was not available, and his colleague would not venture an opinion.  Tests stopped, until the implant company, and my eye surgeon could be reached.  Has Dr. Hagan or other MD's who respond here had any experience with ERG and filtration devices for glaucoma?  Is the test safe to do? Russell903
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Avatar universal
Thank you, Dr. Pernoud, for the good commentary.  I now understand why the ERG cannot be done.  Are there any other tests for retina condition that might be considered?  No doctors I've seen have been able to diagnose the 'flame' like movement in the middle of the eye, as seen when eye is closed or open.  Any suggestions you make would be appreciated.  Russell903
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668969 tn?1227320803
MEDICAL PROFESSIONAL
It's a simple mechanical question because the ERG requires a type of contact cup over
the eye and there is concern that it may disrupt the filter as the device is strategicaaly placed and putting pressure on it could damage the structures in the eye. I don't know if there is an ERG contact which is small enough to avoid putting pressure in this area.  
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