Parents and carers need to play close attention to any signs that a child may not be seeing well. In general, the earlier a problem is detected, the easier it is to put right. If a child shows any of the following signs a full sight test with a qualified optometrist can set your mind at rest: The child closes one eye to look at objects. The child tilts the head when looking at objects. The child cannot judge depth. The child may bump into objects - particular on one side. Many optometrists offer sight testing for pre-school children, and three years is often a good age to do this while the visual system is still developing. However, obvious problems e.g. a clear squint or an inability to recognise toys and faces should be checked out earlier.