Many vision screenings test only for distance visual acuity. It does not indicate how well the eyes focus up close or work together. It also does not give any information about the health of the eyes
Often, administrative personnel or volunteers who have little training conduct a vision screening. While well-intentioned, these individuals do not have the knowledge to competently assess screening results.
Even when done in a pediatrician’s or primary care physician’s office, the scope of vision screening may be limited by the type of testing equipment available. Factors such as room lighting, testing distances and maintenance of the testing equipment can also affect test results.