Periodically, my vision becomes distorted with and arc shaped sliver that is wavy,almost mirror like in appearance and has rainbow colored shimmers. I have no idea what this is or why it happens. There are no other symtpoms and it lasts anywhere from 15 minutes to a few hours.
I've had this same symptom. I did a Google search of "ocular migraine" and came up with a number of helpful sites and articles dealing with this subject. Here's one: http://www.mayoclinic.com/health/ocular-migraine/AN01083. Seems to be a relatively harmless thing.
Your description of this visual disturbance matches mine exactly -- an arc-shaped sliver that is mirror-like, with rainbow shimmers. Mine only occurs after intense exercise, so after reading these posts, I Googled "ocular migraine" with "exertion", and learned that exertion can indeed bring on migraines. Sounds like that may be what I've got going on! Thanks for the lead. I suppose I'll have to visit the doc to rule out other problems.
Here's one nice article I found-- http://www.djo.harvard.edu/site.php?url=/patients/pi/430 , although it doesn't specifically mention our "rainbow sliver" as an ocular migraine symptom. Here's another link that includes an image of a rainbow-type disturbance, but it isn't as much of a "sliver" as mine-- http://www.migraine-aura.org/EN/Visual_Loss.html (about 3/4 of the way down the page). I definitely don't get the "flashing" symptoms that seem to be frequently mentioned for ocular migraines.
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