One of our newer studies demonstrated important improvements in infant visual acuity from 5 to 11 months (visual acuity is the degree to which an infant can see the fine details in an image). Infants were tested using multiple black and white test gratings. As the lines in the test gratings got smaller, it became harder for infants to see the black and white grating against the gray background.
Not surprisingly, visual acuity improved with age. Interestingly, however, there was also a great deal of variability within ages. Using measures like this could help us to understand why infant looking preferences change so dramatically with age.