A novel test for predicting fusional potential in patients with torsional diplopia

Worawalun Honglertnapakul, Charlotte Tibi, Hilda Capo, Kara M. Cavuoto, Craig A. McKeown

Research output: Contribution to journalArticle


We introduce the novel “white disk” test to evaluate fusional potential in patients with torsional diplopia. In this test, a white disk is presented on a black background in a darkened room to eliminate perception of torsion. Horizontal and vertical misalignment is neutralized with prisms when necessary. The absence of diplopia on the white disk test is used to establish fusional ability. Nine patients with torsional diplopia were assessed using this test. All had excyclotorsion (mean, 9.9° ± 4.2°; range, 5°-15°) and could achieve single binocular vision on testing. Postoperatively, 9 patients reported no torsional diplopia in the preferred gaze position, with a mean excyclotorsion of 0.4° ± 2.8° (range, −5° to 4°). The test appeared to predict fusional potential in all patients.

Original languageEnglish (US)
Pages (from-to)31-33
Number of pages3
JournalJournal of AAPOS
Issue number1
StatePublished - Feb 2020


ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Ophthalmology

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