Amsler grid

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Related to Amsler grid: macular degeneration


1. a grating.
2. in radiology, a device consisting essentially of a series of narrow lead strips closely spaced on their edges and separated by spacers of low density material; used to reduce the amount of scattered radiation reaching the x-ray film.
3. a chart with horizontal and perpendicular lines for plotting curves.
Amsler grid see Amsler charts.
baby grid a direct-reading chart on infant growth.
cross-hatched grid two linear grids that are superimposed at right angles to each other, used for maximal scatter cleanup.
Cross-hatched grids are fabricated by sandwiching two linear grids together so that their grid strips are perpendicular. From Bushong, 2001.
grid cutoff differences in radiographic intensity that are caused by improper focusing of the lead lines of a grid.
focused grid a linear grid in which all of the lead strips are aligned in a tilted fashion toward a centering point.
linear grid a grid designed to permit the passage of the primary beam by having lead lines aligned in the same direction separated by radiolucent interspacing material. There are two types, parallel and focused.
Wetzel grid a direct-reading chart for evaluating physical fitness in terms of body build, developmental level, and basal metabolism.

Am·sler chart

a 10-cm square divided into 5-mm squares on which may be projected a defect in the central visual field.
Synonym(s): Amsler grid

Amsler grid

Etymology: Marc Amsler, Swiss ophthalmologist, 1891-1968
a checkerboard grid of intersecting dark horizontal and vertical lines with one dark spot in the middle. To discover a visual field defect, the person simply covers or closes one eye and looks at the spot with the other. A visual field defect is perceived as a defect, distortion, blank, or other fault in the grid. The person may record the defects directly on a paper copy of the grid that may be kept as a permanent record. The Amsler grid is used in testing for macular degeneration.

Amsler grid

[Marc Amsler, Swiss ophthalmologist, 1891–1968]
A grid of lines with a center black dot used by patients with macular degeneration to detect early worsening of their disease. Loss of vision in part of the grid or distortion of the lines (metamorphopsia) requires emergent evaluation for possible fluid or blood in the macula.
References in periodicals archive ?
And, because dry AMD can progress to wet AMD, you should obtain an Amsler grid from your health care professional and use it to check each eye every day for signs of wet AMD.
By comparison, the Amsler grid has a much higher rate (40% or more) of not detecting a scotoma on Amsler grid testing in persons with known scotomas from macular degeneration and its treatment (Fine et al.
Amsler grid testing can detect ARMD (as well as other macular diseases) at a much earlier stage than can visual acuity testing alone.
To order an Amsler grid to give you a timely warning of changes in your eye health, send a self-addressed, stamped envelope to Medical Update.
Sometimes this "wet" type of AMD progresses very rapidly, so self-testing central vision every day, including use of the Amsler Grid, is essential to reveal progression of the condition.
To receive a free email subscription and Amsler grid to be mailed to you, log on to www.
If the patient is relatively asymptomatic and VMT is a chance finding, patients should be advised to self-monitor with an Amsler grid and reviewed to see if spontaneous resolution or progression occurs.
Definitive diagnosis can be made after a comprehensive history, thorough systemic evaluation and complete ophthalmological examination along with investigations such as fundus photography, visual fields, amsler grid test, FFA, ICG and OCT.
The Amsler grid is a subjective test that is sensitive only to drastic changes, but not to those that develop over longer periods.
Daily use of the Amsler Grid (right) can provide timely warning of changes in your eye health.
uk, the materials will include flyers on men's and women's eye health, a guide to dry eyes and an Amsler grid.
You can obtain an Amsler grid from your health care professional, and do this simple test yourself to monitor symptoms of wet AMD.