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
Traditional Korean medicine A notable mushroom used in traditional Korean medicine is "Phellinus linteus" known as Song-gen. Acupuncture is used to withdraw blood or stimulate certain points on humans and animals by inserting them on specific pressure points of the body. Traditional acupuncture involves the belief that a "life force" ("qi") circulates within the body in lines called meridians. Scientific investigation has not found any histological or physiological evidence for traditional Chinese concepts such as "qi", meridians, and acupuncture points, and many modern practitioners no longer support the existence of life force energy ("qi") flowing through meridians, which was a major part of