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Occasional white light flash in my peripheral vision

I am seeing an intermittant flash of white light in my left peripheral vision that looks like a moving circle or C.  I can see it with my eye open or closed and it seems to be worse at times.  Sometimes I don't notice it, but if I am in a dark ambient environment, I can sometimes see it flash every few seconds.  Sometimes I don't notice it at all.  I am 47 y.o. and it just started a few months ago.  Any ideas?
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My daughter is ten years old she has been seeing a white light streak in both eyes several times a day for three days i thought at first it was a detached retina but the odds of having one in both eyes r not good just wonder if anyone has any thoughts on this she has a doctors appt. next week
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you all have been helpful. I got hit in the left eye about a couple of weeks ago and ever since then have been seeing this ball of light "float" from the bottom corner of my left eye to the top corner of my left eye (which is why im on here). Its actually quite aggravating! it happens from seconds to minutes.thought it would go away on its own, but i definately will be seeing a doctor or opthalmologist now! i hope its not vitreous or retina detachment. i still can see perfect.
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Thank you so very much for this information, I too have just started this, at first I thought it was the florescent lights at work.  I did go into my eye doctor and was confirmed to have great vision, she thought it may be a corroded artery, since I have hypertension.  So I then proceeded to see my health doctor and went in for an ultrasound.  Everything was great there too.  I am going to share this information with both doctors because they acted as if they have never ever heard of this before.  I don't have migraines, so I ruled that out myself.  I did notice though, when I put moisture in the form of liquid tears into my eyes it seems to help the symptom.
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I am 59, and have been seeing these flashes for 2 days now.  I know I was seriously dehydrated two days ago.  My blood pressure is normally in the low-ideal range and I have enjoyed terrific health and mobility.  I have taken care of elderly folks since I was 14 and in those 45 years, none of them mentioned this occurring to them.  

I am wondering how many of us are right-handed and press our cell phones hard against our left ears.
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I've had my vision and blood pressure checked, finally after 2 years and two trips to ER, migraines are my issue, just happy to know what it is. Also glad that there's no pain involved.
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I had the same symptoms. In both eyes, mostly at night, sometimes first thing in the morning. A half circle of light at the outside edge of both eyes. I can reproduce this by pressing the inner corners of my eyes, that makes the circles of light appear. Weird. Thorough eye exam diagnosis was posterior vitreous detachment, as described above. Nothing needs to be done. Recheck in one year.
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