All children should be taught to wear sunglasses, especially between 10 AM and 2 PM, when ultraviolet exposure is the most dangerous. This is true even for children with darker eye colors, even though their darker pigments afford partial protection.
Of course, children with light-colored eyes need sunglasses all the more. Ultraviolet exposure is at its peak when children are at high altitudes, snow-covered landscapes, bright sandy beaches, or near reflective bodies of water.
Most people wear sunglasses to reduce glare. This is trivial compared to the long-term protection they afford for the precious ability to see. Fathers can set a good example for their children by wearing sunglasses at the appropriate times.