Article Credit: Canadian Association of Optometrists ( opto.ca ) Video: How can I tell if my child needs glasses? | Dr. Sharmin Habib The development of the visual system continues into early childhood. Glasses prescription does not stabilize until late adolescent to early adulthood. Until that time, children may struggle with symptoms of blurry vision, trouble focusing or poor binocular vision, which is the ability for the two eyes to work together. Since children are still