Scientists hypothesize that a particular type of fat known as P-fat is required for the development of eyesight  Researchers were led to this hypothesis by observing that babies who are fed formulas low in P-fat tend to have worse eyesight than babies fed mother' s milk, which is high in P-fat
It has also been shown that babies that are five to six weeks premature tend to have worse eyesight than babies carried to term
A fetus typically receives high levels of P-fat from the mother during only the last four weeks of pregnancy.