IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. An inscription reads “SEITZ TEST ...

Results from smartphone-based Snellen charts, which are eye charts used to measure visual acuity, are not consistent with results from standard Snellen visual acuity chart tests, according to a study ...

The chart priced at $2,200 has a metal lamp visor and a linen scroll with letters of different sizes. There doesn’t seem to be any type of antique that isn’t sold at auctions, flea markets or shops.

The Jaeger chart was designed to test near vision acuity. Eduard Jaeger von Jaxtthal (1818–1884) was an Austrian ophthalmologist and a professor at the University of Vienna who, in the 1850s, made ...