Children often have blurred vision, which can go undetected. School going children are often picked on by their fellow students or teachers as they are unable to see the distantly situated blackboards. Most times you would find such kids squeezing their eyes to see clearly. If not screened at an early age, these children can develop Lazy Eye or Amblyopia.
Moreover, some infants are born with cataracts. They require cataract removal surgery with lens implantation for normal vision development.