Box 6
Contains 755 Results:
Gamma Unit. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Locomotive with Engineer in cab. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Peeling Fallen Redwood Tree at the Butt, California. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Work or play! Which? - Even if it’s monkey business, Two eyes are better than one. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Huge Bombing Planes of the United States Army Air Corps at Mather Field, Sacramento, Calif. [California] Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Summer Time on the Playground. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Changing Fication from 7 to 4 requires 11.5 prism diopters of Positive Convergence. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Changing Fixation from 1 to 6 requires 15 prism diopters of Positive Convergence. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Fusing the upper pictures requires 3.5 prism diopters of Fusional Convergence. Changing Fixation from upper to lower pictures requires an additional 15 prism diopters of positive Fusional Convergence, a total of 18.5 prism diopters. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.
Changing Fixation from 1 to 4 requires 4.5 prism diopters of positive Convergence. Keystone View Company, undated.
Many of the cards in this series are meant to be educational in nature. There are also some sets that are used for professional reasons. For example, the optometric community used stereographs to gauge vision and diagnose their patients.