According to a number of published clinical studies, omega-3 fatty acids are crucial for normal infant vision development.

A Harvard study showed that healthy pre-term infants that were fed DHA supplemented formula showed significantly better visual acuity at 2 and 4 months, compared to those who were not supplemented with the omega 3.  Another study showed that mothers who received DHA supplements from 4 months of pregnancy  had children who were less likely to have below average visual acuity.

So the lesson is mums eat more fish or flaxseeds!