Which visual capacity do infants develop first?

Eyes function by taking in stimuli (light) and converting it to a readable signal to the brain. As soon as an infant slides out they can detect changes in brightness and track slow-moving pictures/objects.

Where they are lacking when compared to an adult is their visual acuity, or the ability to perceive detail (40x worse than an adult). Objects appear blurry unless they are approximately 8 inches from their face or are bold patterns with sharp contrasts of dark and light.

Visual accommodation or the ability of the lens of the eye to change shape and bring objects at different distances into focus is lacking. It likely will take 6 months to a year before an infant has developed the visual functioning of an adult.