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Related Experiment Videos

Relationship between visual field loss and contrast threshold elevation in glaucoma.

C M Tochel1, J S Morton, J L Jay

  • 1Institute of Biomedical & Life Sciences, University of Glasgow, Glasgow, Scotland, UK. jdm1u@udcf.gla.ac.uk

BMC Ophthalmology
|September 15, 2005
PubMed
Summary
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Glaucoma patients often show elevated contrast thresholds, but these elevations don't always align with visual field loss locations. This suggests contrast sensitivity offers a distinct measure of glaucomatous visual impairment.

Area of Science:

  • Ophthalmology
  • Visual Neuroscience

Background:

  • Glaucoma is associated with elevated contrast thresholds for detecting visual patterns.
  • The precise relationship between these elevated thresholds and the location of visual field loss in glaucoma remains unclear.

Purpose of the Study:

  • To investigate the correlation between contrast threshold elevations and visual field defects in specific peripheral regions of glaucoma patients' visual fields.

Main Methods:

  • Contrast thresholds were measured using laser interference fringes in defined arcuate regions of the visual field (superior, inferior, nasal, temporal).
  • Data were collected from 36 normal controls, 21 glaucoma patients, and 5 ocular hypertensive (OHT) patients, with Friedmann visual fields obtained for all patients.

Main Results:

Related Experiment Videos

  • Elevated contrast thresholds were found in most glaucoma patients (20/21) and some OHT patients (2/5).
  • Abnormal inter-ocular contrast threshold differences were noted in 18/20 glaucoma patients.
  • Correspondence between high contrast thresholds and visual field loss was significant in 5 patients, borderline in 4, and absent in 9.

Conclusions:

  • Elevated contrast thresholds are common in glaucoma, indicating visual system damage.
  • The location of contrast threshold elevations does not consistently match visual field loss, suggesting it provides complementary information to standard visual field testing.