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Article
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
Abstract

• 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.

References
1.
Parks M:  Isolated cyclovertical muscle palsy . Arch Ophthalmol 1958;60:1027-1035.Article
2.
Hardesty H:  Diagnosis of paretic vertical rotators . Am J Ophthalmol 1967;64:914-915.
3.
Vazquez R:  A graphic three-step test . Arch Ophthalmol 1984;102:98-99.Article
4.
Vazquez R:  A computerized three-step test . Ann Ophthalmol 1984;16:443-444.
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