1 - sclera;
2 - ciliary body;
3 - iris;
4 - pupil and anterior chamber filled with aqueous humor;
5 - optical axis;
6 - line of sight;
7 - cornea;
8 - crystalline lens;
9 - choroid;
10 - optic nerve;
11 - optic disc;
12 - fovea;
13 - retina;
14 - vitreous body.
• Be aware of the black color of the point;
• Let the eyes be free to explore the sign and the surrounding surface;
• Then lower your eyelids and visualize it mentally. If you can imagine the completely black point, the eyes will coordinate effortlessly;
• Lift your eyelids and return to observe the point: now it has become sharper;
• The more intense the black you can memorize, the sharper your vision will become.
The convergence phenomenon occurs when objects are observed closely. The eyes are oriented towards the observed object, the two images automatically fall into equivalent points of both retinas. The visual axes converge with restriction of the pupils.
A beautiful example of convergence is reported in Moshe Feldenkrais' book "The Case of Nora". Nora, a Swiss manager suffering from a stroke, learned to read and write through the teachings that Feldenkrais gave her. During the learning phases in which he dealt with the re-education of the eyes he suggests a singular movement.
Take a straw, bring it to your mouth, support it in the middle, keeping it straight and motionless: with your fingers, slowly slide along the straw bringing it to your lips and moving it away to return to the central part.
Running your fingers along the straw is equivalent to focusing on objects from near and far: the eyes look inward and converge for close vision, while diverging separating for distance vision.
Repeat for several times until you see the straw forking in two beyond the fingers until it becomes two distinct images that deviate one to the right and the other to the left of the real straw.
If you close your right eye you will only see the image of the left straw.
By closing your left eye you will see only the image of the right straw.
Sitting on the chair. Look at the tip of the nose. Gaze at the tip of the nose several times for a few seconds and return, then gradually increase the fixation time, until the mind becomes calm and peaceful. Then ...
Observe the space between the eyebrows for a few seconds, let go and repeat the movement, first for a few seconds and then for a few minutes. Fixing the tip of the nose and the space between the eyebrows strengthens vision and the optic nerve. It makes the look bright and promotes the state of inner calm.