Historical information
A set of 70 (incomplete as full set believed to be 85 cards) black and white and colour stereoscopic charts, divided into series Includes geometric, pictorial and photographic examples of charts and Schlechteres Auge test. An instructional leaflet is also included. These featured images thought to strengthen the eye muscles.
Physical description
1 rectangular fawn cardboard box sleeve which contains specially printed cards with pictures and text
Inscriptions & markings
6th edition
