Your brain does the work of intelligently putting together the sharpest parts from each eye's view, but the two eyes see slightly different things, and that makes it harder to judge distances binocularly.
Din hjerne sammensætter så,  på intelligent vis, de skarpeste dele af hvert øjes udsyn, men de to øjne ser lidt forskellige ting og dét gør det sværere at bedømme afstande binokulært.