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.
Nosso cérebro inteligentemente reúne partes mais nítidas da visão de cada olho, mas os olhos veem coisas ligeiramente diferentes, dificultando julgar as distâncias de modo binocular.