OcularMigraines

Fascinating physiological phenomenon: a handful of times during the past few years I've seen bright glowing patches of afterimage-like blobs in my visual field while running. It happened in the 2002 Marathon in the Parks around mile 16, for instance, and again a month ago when I was jogging at night around the track at an old neighborhood high school. The effect is rather like looking through a few big phosphorescent clouds, randomly placed, like one might see after a sudden flash of light. It lasts maybe 10 minutes or so and then fades away.

The blobs don't change shape, or grow slowly, or have zig-zaggy edges --- unlike the classic visual hallucinations associated with migraine headaches, which I've witnessed a few times ~25 years ago. The blobs just interfere a bit with vision, especially in the shade or after dark. I don't know whether they're in the brain or in the eyes or somewhere in between. (They do seem to invert in hue when one blinks; is that a clue?) They're not associated with great physical effort or excessive speed (as anybody who knows my wimpiness can testify!).

I asked about this topic in the Montgomery County Road Runners online discussion group, and got a variety of helpful responses: some thought that I was in big trouble and should see an ophthalmologist immediately ... some explained it as veins, always present in the eye but usually unnoticed ... some proposed an oxygen deficit or brain dehydration or ... etc.

The most plausible hypothesis, though, came from a person who had experienced similar visions and whose eye doctor diagnosed them as "ocular migraine" illusions. Such neural network disturbances could indeed be correlated with dehydration, stress, and other factors. And best of all, this theory doesn't mean that I have to stop running!

(see also MigraineVisions (29 Nov 2001), DreamData (22 Mar 2002), ... )

TopicScience - TopicRunning - TopicPersonalHistory - Datetag20040103

I have been, and am now there too. Although these rays of light that beem from the light source, are now with me all the time, for the past month.

Two eye docs came up with the "ocular migraine"... and one is going to try to fit me with a tinted contact to wear, in efforts to dim the lights so to speak.

I believe mine is related to possible head trama from a car accident in my wee lass days... and compounded by a man-made- left ear, which is a source of constant trouble, pain, infection, and inflamation. Noise will set it off, and I am in for a ride... in my own head.

It seems to be a new area, one still with eyebrows raised high... sigh!

Respectfully C

(correlates: DiffuseConsciousness, RosesByOtherNames, StupidityAndConspiracy, ...)