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The missing temporal crescent

K Landau1, W Wichmann, A Valavanis

  • 1Department of Ophthalmology, University Hospital, Zurich, Switzerland.

American Journal of Ophthalmology
|March 1, 1995
PubMed
Summary
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Detecting a missing temporal crescent, a visual field defect, requires specific perimetric techniques. This study correlates perimetry with MRI in patients with striate cortex lesions.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neuroimaging

Background:

  • The monocular temporal crescent is a specific visual field area.
  • Understanding its representation in the visual cortex is crucial for diagnosing visual field defects.

Observation:

  • Two patients with vascular lesions in the anterior striate cortex were studied.
  • Goldmann perimetry and high-resolution magnetic resonance imaging (MRI) were employed.

Findings:

  • A monocular visual field defect, specifically a missing temporal crescent, was identified contralateral to the lesion.
  • The perimetric findings showed excellent agreement with MRI results.

Implications:

  • This study highlights the importance of using appropriate perimetric techniques to detect temporal crescent visual field defects.

Related Experiment Videos

  • Underdetection may occur with standard perimetry focusing on the central visual field.