| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Ewing vision test chart | Medicine | A visual acuity test chart for illiterates, in which the basic test pattern consists of three parallel bars separated by the width of a single bar, with variously located discontinuities or gaps in the middle bar, each gap having the dimension of a bar width. Source: European Union. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
