https://drstevenrauchman.com/tbi/double-vision-tbi-seeing-two-everything/
Classic double vision occurs when the two eyes are not pointing in the same direction, so the brain gets separate images from each eye. The brain doesn’t like this state of affairs, so the person will often inadvertently close one eye resulting in no double vision. Thus, one very important question to ask an individual who is seeing two of things, is to ask them to close one eye. If the double vision goes away, that’s real double vision.
Classic double vision occurs when the two eyes are not pointing in the same direction, so the brain gets separate images from each eye. The brain doesn’t like this state of affairs, so the person will often inadvertently close one eye resulting in no double vision. Thus, one very important question to ask an individual who is seeing two of things, is to ask them to close one eye. If the double vision goes away, that’s real double vision.
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