Base-In/Base-Out Random Dot Slides
These stereograms have been designed so that one eye sees a picture with a slightly different set of random dots that the picture seen by the other eye. The disparity in the dots causes the pattern to stand out from the random dot background; but only if both eyes are working together.
Cards sets are to be used with the Bernell-O-Scope™ family (BC200, BC200HHTB, BC200HH).
Each set has 8 (Base-In) or 9 (Base-Out) slides of hidden random dot images. Includes cover with instructions for each set and has the hidden shape answer key on the back cover card.
Base-In series has a prismatic effect from 0-14PD
Base-Out series has a prismatic effect from 0-17PD.
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Printed on: Laminated Cardstock
Card Size: 7" x 3.5"
Extras: Spiral bound with answer key on back cover card