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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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
Farlex Partner Medical Dictionary © Farlex 2012

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.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
And, because dry AMD can progress to wet AMD, if you have dry AMD, you might want to discuss with your health care professional whether you should use an Amsler grid to check each eye regularly 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., 1986; Schuchard, 1993).
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.
Detection of ARMD includes recognition of its symptoms, an amsler grid test and a fluorescein angiogram.
These changes may include difficulty in reading, distortion of straight lines, or abnormal findings on the Amsler Grid Chart.
A two-month trial involving 27 patients with AMD or diabetic retinopathy found strong agreement between visual acuity and Amsler grid testing results as measured by the app and by an eye care professional in a clinical setting.
Central and paracentral scotomas were noted on Amsler grid testing, worse in the right eye, and confirmed with Humphrey visual field testing (Figure 1).
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.
(6) The patient was advised to self-monitor with an Amsler grid and would be reassessed on a monthly basis with OCT.