1. Either have the subject or the helper hold the cards
2. The cards should be held about 40 cm from the subject.
3. Begin with the two cards together with the “A”s touching.
Convergence (eyes pointing inwards)
1. The subject should see two cards at this point.
2. Ask the subject to try and cross his eyes and get the feeling of looking closer.
3. If he cannot do this voluntarily, let him look at your finger placed between the patient’s face and the cards.
4. When he achieves fusion he will see “three sets of circles.” (sometimes it helps to look for four sets first and then fuse the middle ones)
5. Explain that he is to concentrate only on the middle set (which is imaginary) and to ignore the two side images.
6. Ask him about the middle set of circles. He should be able to spontaneously indicate that he sees two circles, one larger than the other and that the larger one appears to be floating closer to him. In addition, he should see the word “clear”, in focus. It is important to make the subject aware that this perception of depth is a feedback cue about his performance.
7. Once he can achieve fusion ask him to hold the position for 5 seconds, look away momentarily, and look back at the cards and regain fusion.
8. Instruct the subject to repeat these 10 times and then separate the cards about 1 centimeter and repeat the entire procedure again. Continue until he is able to achieve fusion, look away and back with the cards separated about 12 cm.
1. The same general procedures are performed for divergence therapy except that the subject must now diverge behind the plane of the cards.
2. Subjects often experience some difficulty initially with this procedure.
3. If he cannot do this voluntarily, let him look at your finger placed further away from patient than the cards