According to the American Optometric Association (AOA) children should have their eyes examined by an eye doctor at 6 months, 3 years, at the start of school, and then at least every 2 years following. If there are any signs that there may be a vision problem or if the child has certain risk factors (such as developmental delays, premature birth, crossed or lazy eyes, family history or previous injuries) more frequent exams are recommended. A child that wears eyeglasses or contact lenses should have his or her eyes examined yearly. Children’s eyes can change rapidly as they grow.
You can ensure that your baby is reaching milestones by keeping an eye on what is happening with your infant’s development and by ensuring that you schedule a comprehensive infant eye exam at 6 months. At this exam, the eye doctor will check that the child is seeing properly and developing on track and look for conditions that could impair eye health or vision (such as strabismus(misalignment or crossing of the eyes), farsightedness, nearsightedness, or astigmatism).
Since there is a higher risk of eye and vision problems if your infant was born premature or is showing signs of developmental delay, your eye doctor may require more frequent visits to keep watch on his or her progress.
This is the age when parents should be on the lookout for signs of lazy eye (amblyopia) – when one eye doesn’t see clearly, or crossed eyes (strabismus) – when one or both eyes turns inward or outward. The earlier these conditions are treated, the higher the success rate.
Parents should also be aware of any developmental delays having to do with object, number or letter recognition, color recognition or coordination, as the root of such problems can often be visual. If you notice your child squinting, rubbing his eyes frequently, sitting very close to the tv or reading material, or generally avoiding activities such as puzzles or coloring, it is worth a trip to the eye doctor.
In addition to the symptoms written above, signs of vision problems in older children include:

The doctor will also examine the area around the eye and inside the eye to check for any eye diseases or health conditions. You should tell the doctor any relevant personal history of your child such as a premature birth, developmental delays, family history of eye problems, eye injuries or medications the child is taking. This would also be the time to address any concerns or issues your child has that might indicate a vision problem.
If the eye doctor does determine that your child has a vision problem, they may discuss a number of therapeutic options such as eyeglasses or contact lenses, an eye patch, vision therapy or Ortho-k, depending on the condition and the doctor’s specialty. Since some conditions are much easier to treat when they are caught early while the eyes are still developing, it is important to diagnose any eye and vision issues as early as possible.
Following the guidelines for children’s eye exams and staying alert to any signs of vision problems can help your child to reach his or her potential.