The disruption of binocular vision is evident in the case of regulatory internal obliquity and partially regulated internal obliquity. To understand these two conditions, we must first talk about normal binocular vision. Normal binocular vision: Under normal conditions, both eyes are orthophorically aimed at an external target at the same time, and the images of the two eyes are fused in the brain to form a monocular image with a sense of stereo. The brain takes the separate images of the two eyes and fuses them into a single image, called binocular vision. The perception of three-dimensional objects and depth is called stereopsis. Stereopsis is the highest level of binocular vision and requires the brain to process visual information from both eyes simultaneously, which is a complex process. Binocular vision develops in early infancy, during which time it is necessary for binocular vision to develop.