These activities aim at training eyes to find visual differences, as well as at training eyes ability to follow lines (or another set direction). To be successful the child must fix a certain image pattern in his or her memory and then he or she compares it with other images. Well-developed visual perception is the key ability influencing correct reading. If your child has a problem with tasks of this type, it is possible that he or she might have difficulty to learn read fluently in the future. This is the main reason why to do this type of exercise with children in early age. A suitable non-paper alternative to train visual perception is, for example, the game ‘Guess what has changed!’.