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November 1984

A Mechanical Three-Step Test

Author Affiliations

From the Department of Ophthalmology, Brown University Program in Medicine, and the Division of Ophthalmology, Veterans Administration Medical Center, Providence, RI.

Arch Ophthalmol. 1984;102(11):1712. doi:10.1001/archopht.1984.01040031396035

• A simple mechanical binary search device is described that can be used to perform the Parks' three-step test. Instructions to make the device from light cardboard are provided.

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