A pair of strabismus diagnostic and exercise cards in black and white. The card to the left, 11, has the image of a frog about to jump off a platform through a hanging hoop while another frog is looking up from the pool; the card to the right, 11a, has the image of a frog jumping off the platform through the hanging hoop wtih a flying bird in the background. Stereoskopische Bilder für schielende Kinder.
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Related Title(s):
Hidden treasure and Is part of: Stereoskopische Bilder für schielende Kinder.; See related catalog record: 52331180R