The document provides information on testing for blindness in children aged 3 months to 4 years. It suggests holding an object in front of the child and moving it from side to side to check if their eyes follow the movement. It also recommends standing 3 meters away and asking the child to count 3 fingers to check for potential difficulty seeing at a distance or in low light. The document lists some potential causes of blindness in children such as the mother having German measles during pregnancy or complications during birth. It stresses the importance of educating parents on how to support a blind child's development and independence.