[slim]

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slim,

How is it that even though my left eye is noticeably poorer than my right eye, I can still see more clearly with both eyes than with just my right?

It seems clear that the brain is not simply "adding" the two images together; it is using the information from my left eye, even though it is poorer, to improve the view from the right. Any clue how that works?

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You are using both eyes, not just the right.Even though your left eye is blurrier, it is still adding to the overall image bc it is seeing the object from a slightly different angle which the right eye cannot see. Tpgether, they make a 3D image.