| Fridenberg, Percy | <person> U.S. Ophthalmologist, 1868-1960. See: Fridenberg's stigometric card test. (05 Mar 2000) |
|---|
| Herring, Percy | <person> English physiologist, 1872-1967. See: Herring bodies. (05 Mar 2000) |
|---|---|
| Fridenberg's stigometric card test | An obsolete test of vision and accommodation for illiterates, using a card containing a series of dots and squares of graduated size, to be counted at various distances. (05 Mar 2000) |