The major tenet of the field of developmental vision is that vision is learned and built on a developmental sequence which needs to take place.
Each skill is built on the previous skill. For instance, normal visual develop development follows a visual motor hierarchy from oral to tactile to visual.
Motor for instance when a very young child is given a puzzle, he/she may put the puzzle piece in their mouth to learn about it. A slightly older one may jam the pieces together without looking at them to try to fit them together.
A child who has reached visual motor maturity will examine the puzzle piece and judge how the pieces fit together to make a whole.
A. M. Skeffington, an optometrist, first described the first four circle representation of the developmental vision in 1963.