This is a pupilometer from around 1900. The cross hairs are centered over the subject’s pupils and the “P.D.” (interpupillary distance) read on the top scale. Original cost was $3.00.
This is a pupilometer from around 1900. The cross hairs are centered over the subject’s pupils and the “P.D.” (interpupillary distance) read on the top scale. Original cost was $3.00.
