During 1930s and 1940s, Skeffington became imbued with the idea of how vision is developed, and how it could be developed more effectively. The research was instigated at the Gessell Institute, at Yale, and in 1949, the book, “Vision – Its Developmental in Infant and Child”, was published. “Developmental Vision” and “Preventive Optometry” were added to the ever-expanding “concepts” and practices of optometry.