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Related Experiment Videos

Rapid contrast sensitivity assessment in keratoconus.

K Zadnik1, M J Mannis, C A Johnson

  • 1Department of Ophthalmology, University of California, Davis.

American Journal of Optometry and Physiological Optics
|September 1, 1987
PubMed
Summary

Simple charts can detect contrast sensitivity loss in early keratoconus (corneal disease) even with normal vision. These tools aid in monitoring disease progression and treatment effectiveness.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Contrast sensitivity impairment can occur in keratoconus (KC), even with normal Snellen visual acuity.
  • Computer-driven tests confirm these deficits, but clinical utility is limited by device complexity.

Purpose of the Study:

  • To evaluate the clinical utility and efficacy of rapid screening devices for contrast sensitivity testing in keratoconus patients.
  • To assess if simple chart systems can detect contrast sensitivity abnormalities in early KC.

Main Methods:

  • Twelve patients diagnosed with keratoconus were tested using two simple chart systems: the Vistech chart and the Regan multi-contrast visual acuity charts.
  • These charts are designed for rapid, clinically practical contrast sensitivity assessment.

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Main Results:

  • Both the Vistech and Regan charts successfully identified contrast sensitivity abnormalities in patients with early keratoconus.
  • Some patients with visual acuity of 6/12 (20/40) or better struggled with high spatial frequency and low contrast tasks on these charts.

Conclusions:

  • Simple wall charts can be effective tools for detecting visual abnormalities in early keratoconus.
  • These charts show potential for monitoring disease progression and evaluating treatment outcomes in keratoconus management.