Amsler grid
Amsler Grid
The Amsler grid (pronounced: /ˈæmzlər ɡrɪd/) is a tool that eye care professionals use to detect vision problems resulting from damage to the macula (the central part of the retina) or the optic nerve. The damage may be caused by macular degeneration or other eye diseases, so the Amsler grid helps monitor changes in vision.
Etymology
The Amsler grid is named after its creator, Marc Amsler, a Swiss ophthalmologist. He introduced this simple and effective tool in 1947.
Description
The Amsler grid is a square grid of horizontal and vertical lines. The grid was originally described as 10x10 cm square with 0.5 cm blocks, making a total of 400 squares. The grid is usually white, and the lines are black. In the center of the grid, there is a dot for fixation.
Usage
Patients with macular degeneration may see wavy lines or some blocks may appear missing. A normal Amsler grid appears as a square of straight lines, with a fixation point in the center. Any irregularity is a potential sign of retinal disease.
Related Terms
- Macula: The small area in the retina that provides the clearest, most detailed vision.
- Optic nerve: The nerve that transmits visual information from the retina to the brain.
- Macular degeneration: A medical condition which may result in blurred or no vision in the center of the visual field.
External links
- Medical encyclopedia article on Amsler grid
- Wikipedia's article - Amsler grid
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