It can be mild or severe. Eighty percent of vision loss can be prevented or treated. People with vision loss lead full and active lives. Finds out what causes vision loss, why it's important to get regular eye exams, and what you can do to help someone with vision loss. Level 3 readers are aimed at children who are reading by themselves and can grasp new concepts. Key words and captions help readers understand new vocabulary and more challenging sentence structure. This project has been made possible in part by the Government of Canada.