Short-sightedness (myopia) is the most common disease of eye refraction. According to the estimates of the scientists, 30% of the Europeans and 60% of the Asians suffer from short-sightedness. In most cases, the defect occurs before the 20. year of age. When it comes to anatomy, the eyeball is lengthened, which causes the improper refraction of light rays falling into the eyeball and focusing of the rays before instead of on the retina.
More information on this defect can be found here
It is a basic exercise which is good for the defects of short-sightedness. Those who have correct vision should also do this exercise as often as possible to maintain the good sight or even better than 20/20.
This exercise is designed to relax the eye oblique muscles that are used to change the eye optical length, and are responsible for proper and acute vision.
This exercise allows to practice the alternate perception from near and far, which improves eye accommodation and spatial perception.
This exercise helps to assess the individual range of good vision (near and far points) and extend it.
This exercise consists in “cheating the eyes” while reading a text (a chart or book) set very close to the eyes (0-9 cm). As we draw the chart nearer and nearer, the print starts to blur, which is due to the lack of accommodation in such a short distance. A person suffering from far-sightedness will experience focusing of the image on the retina at least for a while or even behind it (paradoxical farsightedness). Owing to that, our mind sends a signal to the eyes that the further straining of the oblique muscles is useless. This signal should result with relaxation of muscles, the so-called softening of sight and this is what we really want to achieve. Similarly, moving a book like the trombone allows to extend the perception field by the smooth change of accommodation.
This exercise allows to practice the change of accommodation and thus improve our acuity.