Research has shown that young children are able to perceive visual stimuli with the same precision as adults, but this ability develops over time. Binocular disparity, or the slight difference in the images seen by each eye, plays a role in this development. By 6 months of age, children are able to perceive binocular disparity and use it to perceive depth. However, it is not until about one year after birth that children's visual acuity reaches adult levels. By the time a child is approximately 4 years old, their ability to perceive visual stimuli with precision is fully developed.