38 Plate examination Publication.
Accepted by leading authorities as a basic and also exact method for discovering congenital color loss of sight as well as red-green loss of sight, each in the 2 types, total and also insufficient.
Consists of four special plates for examinations to establish the kind as well as degree of defect in shade vision.
Takes advantage of the peculiarity that in red-green loss of sight, blue and also yellow appear incredibly bright compared with red and green.
Color plates encased in specifically created album-type publications for convenience of handling. Comprehensive directions included.