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Besides having only one good eye, there are genetic factors. Some people do not have a large proportion of their brain committed to seeing in 3D. There are advantages and disadvantages. A disadvantage might be failing to catch easily a thrown handball. An advantage might be working on a bridge, high above the St. Lawrence seaway, without having the fear of heights and subsequently falling.

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10y ago
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Q: What does it mean when a person can only see in 2D?
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