Seeing as my eyes are failing, my having it probably comes from overuse of the right eye due to compensation for the left (which is, in fact, blind).
English
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My right left eye is "twice as strong" as my right eye to compensate as the right one has a weak muscle. I'm supposed to wear glasses to correct my right eye.
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Yikes. That's interesting it appeared from that though, it makes me wonder what's causing it.