Do we SEE in 3D or is our Space 3D? To see things in 4D do you need 4D eyes for 4D space?
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Seeing involves not only the eyes but the brain. Each of your retinas captures a two dimensional projection of light reflected or emitted by things in three dimensional space. Assuming you have two (or more) working retinas, your brain combines multiple two dimensional images into a three dimensional model of the space in front of or around you.
In four dimensional space I imagine you’d need a three-dimensional retina (not a two dimensional retina wrapped around a three-dimensional volume, rather a three dimensional organ filled with photoreceptors and nerves connecting each of them to the brain) surrounded by a four-dimensional lens to focus incoming light rays. My brain, having only experienced three dimensional space, can’t picture a four dimensional lens, but that’s what I think it would take.
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