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
Fragmentation (medicine) lithotripsy. The code for fragmentation in ICD-10-PCS is 0FF. Fragmentation (medicine) In medicine, fragmentation is an operation that breaks of solid matter in a body part into pieces. Physical force (e.g., manual force, ultrasonic force), applied directly or indirectly through intervening body parts, are used to break down the solid matter into pieces. The solid matter may be an abnormal by-product of a biological function, or a foreign body. The pieces of solid matter are not taken out, but are eliminated or absorbed through normal biological functions. Examples would be the fragmentation of kidney and urinary bladder stones (nephrolithiasis and