The mind is an amazing thing, especially when it comes to perceiving the world through 2D eyesight. The mind creates 3D. It also fills in the blindspot of each eye by using colors and shapes provided in the 2D images from each eye, like an automatic photoshop program constantly running in the background to coverup what would otherwise be two black spots in our vision, the place on each retina where the optic nerve connects to the eye. It is truly amazing.
In reality we SEE (through visual input) a couple of 2D images, each with a black dot, the black dots being where there are no receptors for light due to optic nerves connected to the retinas. The brain's cerebral cortex takes what we literally SEE and creates the perception of 3D, filling in those black spots along the way. The brain itself sees nothing. It receives input from the eyes in the form of electrical signals and then creates (makes up) the world we see based on these signals and prior experiences.
I mean, if you want to be scientifically correct, the above statements analytically define how vision works. No assumptions. The critical thinking style is to just simply say, "We see in 3D", which combines all the working parts (visual input from the eyes along with the brain's visual processing capabilities), encompassing all as a whole, as one working unit, which is also correct.