Amsler grid Amsler grid The Amsler grid, used since 1945, is a grid of horizontal and vertical lines used to monitor a person's central visual field. The grid was developed by Marc Amsler, a Swiss ophthalmologist. It is a diagnostic tool that aids in the detection of visual disturbances caused by changes in the retina, particularly the macula (e.g. macular degeneration, Epiretinal membrane), as well as the optic nerve and the visual pathway to the brain. In the test, the person looks with each eye separately at the small dot in the center of the grid. Patients with macular disease may see
The body in traditional Chinese medicine the San Jiao or Triple Burner has no anatomical correspondent at all, and is said to be completely a functional entity. Chinese Medicine and The Model of the Body is founded on the balance of the five elements: Earth, Metal, Water, Wood, and Fire. The elements are infinitely linked, consuming and influencing each other. Each element corresponds to different organs in the body. The organs act as representatives of the qualities of different elements, which impact the physical and mental body in respective ways. Each organ is categorized as either Yin or Yang. The energies of Yin and Yang are