There are tests that can be used on infants and preschool children who cannot read. If you have any concerns about your child’s vision, you find a local optician who will test their vision. However, if you have no concerns it’s perhaps better to wait until your child is a little older – say around three and a half years – before taking them for a full eye examination. Even if your child’s vision seems good, it’s worth taking them for a full sight test at a qualified optician when they reach school age, just to make sure that there aren’t any issues with their vision that are likely to affect their early school years.