An Old School of Thought
Parents and educators often incorrectly assume that if a child passes a school vision screening, an eye problem does not exist. However, this is an antiquated way of thinking about vision.
School vision screenings often test visual acuity (sharpness and clarity) only and not for things like ocular motility, binocular vision, and accommodation all vital components of vision, extraocular muscle movement, and brain function.
In reality, the visual skills needed for successful reading and learning are much more complex. A child who can see 20/20 can still have a serious vision problem.