People with hemianopsia can only process half the information their eyes are receiving (usually as a result of a stroke). The main side effect is that they're constantly bumping into things they never saw coming. This in itself isn't that terrible, because if you know something is outside your line of sight, you can usually, you know ... turn and look at it. The problem comes when you don't know that. When paired with a related condition called visual neglect, hemianopsia sufferers don't realize they have a gap in their vision and can't compensate for it. They probably simply think they're extra klutzy.

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"Hahaha! I'm such a doofus."

Merely crossing the street can be a dangerous adventure (moreso than usual) when you can only see half the vehicles, pedestrians, and middle fingers coming at you. And think of the danger of driving a car -- how can you send a proper text about the traffic when you can only see half the keyboard?

The worst part is that if you don't recover from this condition right away, you're probably stuck with it forever. Imagine going through life thinking you're getting the full picture when you're definitely not. Well, at least you can always go into politics! *Cue rimshots until the heat death of the Universe.*