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A slight flash

A slight flash

I noticed a couple of days ago while reading, when I blinked I saw a small spot or a flash. It reoccurred other times while reading, but not every time I blinked. The flash, on a smaller scale, is similar to what happens after someone takes a picture using a flash, and you see the flash every time you blink until it goes away. Should I be concerned this is a retinal issue? Or is this eyestrain? It has only been happening for less then a week.
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This is an entopic phenomenon.  I would not worry about it.

Flashes and floaters of concern occurs blinking.

Dr. O.
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