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Related Experiment Videos

The monocular vertical prism dissociation test.

Karl C Golnik1, Andrew G Lee, Eric R Eggenberger

  • 1Department of Ophthalmology, Neurology, Neurosurgery, University of Cincinnati and The Cincinnati Eye Institute, Cincinnati, Ohio, USA. kgolnik@cinci.rr.com

American Journal of Ophthalmology
|January 1, 2004
PubMed
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The vertical prism dissociation test effectively distinguishes between organic and nonorganic visual loss in patients. This simple test aids in diagnosing visual acuity impairments quickly and accurately.

Area of Science:

  • Neuro-ophthalmology
  • Visual Sciences

Background:

  • Differentiating organic from nonorganic visual loss is crucial for accurate diagnosis and treatment.
  • The monocular vertical prism dissociation test is a potential tool for this differentiation.

Purpose of the Study:

  • To evaluate the efficacy of the monocular vertical prism dissociation test in distinguishing between organic and nonorganic monocular visual loss.

Main Methods:

  • A prospective, single-masked observational study was conducted across three neuro-ophthalmology practices.
  • Participants included normal controls, patients with known organic visual loss, and patients with suspected nonorganic visual loss.
  • A 4-prism diopter base-down prism was placed before the better eye, and participants reported seeing one or two images of a Snellen letter.

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Main Results:

  • Normal controls and patients with organic visual loss consistently reported two and one image, respectively.
  • 31 of 35 patients with suspected nonorganic visual loss reported two images, indicating nonorganic loss.
  • Four patients initially presenting with suspected nonorganic loss who reported one image were subsequently diagnosed with occult pathology.

Conclusions:

  • The vertical prism test is a rapid and effective method for differentiating organic from nonorganic monocular visual acuity loss.
  • This diagnostic tool can aid clinicians in identifying the underlying cause of visual impairment.