a total of 12 early 20th century vintage medical die cut heavy card stock "handlers" depicting 24 disease conditions of the human eye. original storage box with lid contains the detailed reference key, listing each and every condition or disease state found on either side of the brightly colored graphical handlers. the optometrist used the compact diagnostic kit as an efficient visual aid for the proper diagnosis of various eye conditions. manufactured by charles t. davis, brooklyn, ny. removed from the office of erwin g. clahassey, a recently deceased optometrist who practiced in grand rapids, mi.