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Individual
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Individual
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Priority to ES0175492UpriorityCriticalpatent/ES175492U/en
Publication of ES175492UpublicationCriticalpatent/ES175492U/en
Visual acuity tester, which is characterized by being a sheet of appropriate material to ensure a certain rigidity, such as cardboard, adopting a shape similar to that of glasses, with two widening corresponding to the two eyes, separated by a notch for mounting on the bridge of the nose and with a lateral extension as a handle, it offers in the center of the two widening corresponding to the eyes and in a centered position, a plurality of small through holes, conveniently grouped in a small area , which will be placed in front of the eyes, when looking to the front, and through which the signs or letters of a "test" can be seen or read, whose vision compared with that obtained without the tester, will determine whether or not they exist defects in vision. (Machine-translation by Google Translate, not legally binding)
ES0175492U1971-12-181971-12-18Visual acuity tester (Machine-translation by Google Translate, not legally binding)
PendingES175492U
(en)
Observation apparatus of photographic positives, postcards, engravings, etc., giving the vision of relief and allowing combinations of colored lighting