If we had a third eye, would we be able to see in 4D?
While losing an eye loses a dimension, or depth, adding an eye doesn’t add an extra fourth dimension.
What we see is created by the brain using a 2D image from the eyes. A third eye might further assist our perception of depth, but the brain would still interpret the image as 3D. Humans are able to see in three dimensions: length, width and depth. Physicists have theorised a fourth dimension – time – but living in a 3D world, our brains wouldn’t know how to process or understand further dimensions.