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This original Keystone Diagnostic Series stereoview card (DB1) was created as part of Keystone’s professional Visual Acuity and Eye Training System. The card features a detailed forest pathway overlaid with progressively smaller geometric dot-square targets used to evaluate depth perception, focusing ability, and visual acuity through a stereoscope.
On the reverse, the card includes a full Snellen-scale reference chart (feet and meter), AMA percentages, and instructions for identifying each dot position.
A high-quality educational stereograph, it reflects both scientific optical testing and the classic photographic style Keystone is known for. Ideal for collectors of medical, optical, or Keystone stereoscopic material.
Condition:
Very good vintage condition with light edge wear and mild surface handling typical of diagnostic stereoviews. Image remains clear and targets well defined.
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