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Contrast sensitivity.

Cynthia Owsley1

  • 1Department of Ophthalmology, School of Medicine, University of Alabama at Birmingham, 700 South 18th Street, Suite 609, Birmingham, AL 35294-0009, USA. owsley@eyes.uab.edu

Ophthalmology Clinics of North America
|June 18, 2003
PubMed
Summary
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Contrast sensitivity measures how much contrast is needed to see a target, unlike visual acuity. Chart-based tests using gratings or letters are common for assessing this visual function.

Area of Science:

  • Ophthalmology and Vision Science
  • Visual Perception

Background:

  • Spatial contrast defines image borders, crucial for pattern and object recognition.
  • Contrast sensitivity quantifies the minimum contrast required for visual detection, distinct from visual acuity.

Purpose of the Study:

  • To elucidate the role and application of contrast sensitivity measurements in clinical and research settings.
  • To differentiate contrast sensitivity from visual acuity and highlight the utility of contrast sensitivity testing.

Main Methods:

  • Review of common chart-based contrast sensitivity testing methods.
  • Discussion of target types, including sine-wave gratings and letters.
  • Consideration of chart selection criteria for clinical and research purposes.

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Main Results:

  • Contrast sensitivity testing reveals visual deficits missed by acuity tests.
  • It offers a method for monitoring treatment efficacy.
  • Provides insights into visual performance challenges in impaired vision.

Conclusions:

  • Contrast sensitivity testing is a valuable tool for comprehensive visual assessment.
  • Appropriate chart selection is crucial for accurate diagnosis and research.
  • Enhances understanding of visual function beyond simple resolution.