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August 1940


Arch Ophthalmol. 1940;24(2):221-224. doi:10.1001/archopht.1940.00870020013001

The obvious, but at present unattainable, ideal is for every school child to have a yearly ocular examination by a competent opthalmologist. As this is impracticable, some type of screening test must be carried out in the schools, either by lay persons or by the attending general physician. An attempt has been made to evaluate some of the present methods used in the schools by a comparison of the results of following charts and tests :

  1. The Snellen chart

  2. The Betts test

    • As interpreted in Betts's textbook on reading difficulties, published in 1936

    • As interpreted by the department of child welfare, independent school district of Davenport, Iowa

  3. A group of ophthalmic tests, consisting of the Snellen chart at 6 meters, the Duane screen test at 6 meters and 33 cm. and the Worth four dot test at 6 meters and 33 centimeters

(This group of tests will hereafter be referred to

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