| Snellen | Hermann, Dutch ophthalmologist, 1834-1908. See: Snellen's test types, Snellen's sign. (05 Mar 2000) |
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| Snellen's sign | <clinical sign> Bruit heard on auscultation over the eye in a patient with Graves' disease, due to the hyperdynamic circulation. (05 Mar 2000) |
| Snellen's test types | Square black symbols employed in testing the acuity of distant vision; the letters vary in size in such a way that each one subtends a visual angle of 5' at a particular distance. (05 Mar 2000) |
| Amsler's chart | A 10-cm square divided into 5-mm squares upon which an individual may project a defect in the central visual field. (05 Mar 2000) |
| chart | 1. A recording of clinical data relating to a patient's case. Synonym: curve. 3. In optics, symbols of graduated size for measuring visual acuity, or test types for determining far or near vision. See: Snellen's test types. Origin: L. Charta, sheet of papyrus (05 Mar 2000) |
| Walker's chart | A system of plotting the relative foetal and placental sizes. (05 Mar 2000) |
| quality control chart | A chart illustrating the allowable limits of error in laboratory test performance, the limits being a defined deviation from the mean of a control serum, most commonly ±2 SD. See: quality control. (05 Mar 2000) |
| isometric chart | A chart or graph that displays three dimensions on a plane surface. (05 Mar 2000) |
| Tanner growth chart | A series of chart's showing distribution of parameters of physical development, such as stature, growth curves, and skinfold thickness, for children by sex, age, and stages of puberty. (05 Mar 2000) |