This girl is at the age of 23 months and has been playing with the LEA Puzzle and the LEA DOMINO cards for several weeks. She places the puzzle pieces with no hesitation and can be tested with single symbols and with some difficulty also with the line test when pointing with finger is allowed. In evaluation of amblyopia, the line test depicts the function of the eyes better than a single symbol test, so we try to start using the line test as early as possible, if there is any possibility of amblyopia, lazy eye.