Every once in a while (couple days to couple months--not sure what causes it), I develop a large blurry area in the left side of the vision in my left eye. Things that pass through it (like my hand) become somewhat invisible, and it looks similar to what happens when you push on your eyes when closed (fireworks/fractals).
It's difficult to write or type because when I focus on text, a lot of the stuff to the left of it (like the beginning of the sentence) disappears or becomes obscured.
Any idea what this is?
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