Normal vision for a 12-year-old is generally considered to be 20/25 or better.
This means that a 12-year-old with normal vision can see something clearly at 20 feet that a person with 20/20 vision can see clearly at 25 feet. In simpler terms, their vision is very close to perfect. While 20/20 is often cited as "perfect" vision, 20/25 or better falls within the normal range for children and indicates good visual acuity. It's important to note that vision can vary slightly among individuals.
It's important to have regular eye exams to ensure a child's vision is developing properly and to catch any potential problems early.