Dog and Pig Simultaneous Perception Stereoview Keystone Vision Test Card

This original Keystone Stereoscopic Service vision-training stereoview card (DB-10A) was part of the Keystone Telebinocular Tests of Visual Efficiency series. The front artwork shows a humorous illustrated scene of a dog leaping toward a pig that is stepping through a hoop, used historically to test simultaneous perception and binocular coordination.

Produced by the Keystone View Company, these cards were used in optometrist offices, schools, and clinics for early 20th-century visual training. This card features crisp, whimsical graphics on a deep black background and includes detailed instructional text on the reverse describing the expected visual responses during testing.

Perfect for collectors of stereoviews, optical history, educational tools, and antique medical or vision-training ephemera.

Condition:
Some visible edge and corner wear, small scuffs, and light surface marks typical of age. Image area remains clear and readable. Overall good vintage condition with expected handling wear.

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