You can encourage visual stimulation in children as newborns and at an early age with the help of pronounced contrasting colours and patterns on toys and decorations.
When a child finds themself in a new environment, give them time to focus on the things around them. Make sure to approach objects from all angles so that the child gets familiar with a wider field of vision. Games that involve hiding and uncovering the eyes of newborns can help encourage coordination between sight and movement. This can also be achieved with very young and school-aged children by passing a ball around.