What is the role of a Park 3-step test in the workup of diplopia?

Updated: May 21, 2019
  • Author: Jitander Dudee, MD, MA(Cantab), FACS, FRCOphth; Chief Editor: Andrew G Lee, MD  more...
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The Park three-step test can help elucidate which of the 4 extraocular muscles responsible for vertical eye movements are responsible for a vertical diplopia. Although first appearing impossibly complex, this test follows a logical progression to progressively eliminate groups of muscles from the 4 pairs.

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