How does binocular vision help people judge distances?

Monocular vision (1 eye): Allows us to see 2D images in motionSuitable for short distances but not for long Binocular vision (2 eyes): Allows for depth perception through something called stereopsis (combining the image from each eye) --> 3D image There are 2 main aspects working together to achieve this: Convergence and Disparity Convergence - when objects are close, eyes move to the centre (cross-eyed), the more the eye muscles are strained, the closer the object is Disparity - Distance between eyes is approx. 6cm so each eye sees slightly different image - the brain puts these together into one image The more similar the image in each eye, the further away the image is