The Brock String is named after Frederick Brock and is used extensively in vision therapy. It is a length of string with a number of beads secured at evenly spaced intervals.
“The Brock string is commonly employed during treatment of convergence insufficiency and other anomalies of binocular vision. It is used to develop skills of convergence as well as to disrupt suppression of one of the eyes.
During therapy, the one end of the Brock string is held on the tip of the nose while the other is tied to a fixed point. The three beads are spaced out at various distances. The patient is asked to focus on one of the beads while noting the visual input of each eye and sensation of convergence. The patient can use various techniques to make easier or more difficult by bringing the beads closer\further to the nose and by employing lenses and prisms.
Although this procedure is usually associated with binocular vision and anti-suppression therapy, it can also be a valuable procedure for developing accurate fixation skills under binocular conditions”. Source: Wikipedia
Read a detailed description of How to use a Brock String. This is one of the best daily exercise routines that can easily be used to improve vision naturally.
Magic Eye Books
Magic Eye 3D Illusion images is another excellent way to improve vision. The ‘Magic Eye Beyond 3D book is particularly useful and has a detailed description of the benefits of using the 3D images.