My 20-month-old granddaughter epitomizes the value of vision. Because we don't live nearby, it is often months between our visits. The changes are remarkable at that age. What makes a baby want to grow and progress? Where does she get the vision to want to learn skills such as walking, talking, dressing herself, and feeding her doll? A child's vision comes from watching her parents. When we talk to our kids, they begin to echo the sounds. As we dress them, they want to do it themselves. As they experience the love of parents who feed and protect them, they care for their dolls—and eventually their own children.   So…