| Fridenberg, Percy | <person> U.S. Ophthalmologist, 1868-1960. See: Fridenberg's stigometric card test. (05 Mar 2000) |
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| Herring, Percy | <person> English physiologist, 1872-1967. See: Herring bodies. (05 Mar 2000) |
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| 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) |
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