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CLOCK CHART(®): a novel multi-stimulus self-check visual field screener.

Chota Matsumoto1, Mariko Eura, Sachiko Okuyama

  • 1Department of Ophthalmology, Kinki University Faculty of Medicine, 377-2 Ohno-Higashi, Osaka-Sayama, Osaka, 589-8511, Japan, chota@med.kindai.ac.jp.

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The CLOCK CHART(®) effectively screens for glaucoma visual field abnormalities. This simple, reliable self-check tool demonstrates high sensitivity and specificity in patients with glaucoma.

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Area of Science:

  • Ophthalmology
  • Visual field testing
  • Glaucoma diagnostics

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Early detection of visual field abnormalities is crucial for managing glaucoma.
  • Existing visual field tests can be time-consuming and require specialized equipment.

Purpose of the Study:

  • To evaluate the clinical usefulness of the CLOCK CHART(®) for glaucoma visual field screening.
  • To assess the sensitivity and specificity of the CLOCK CHART(®) in glaucoma patients.
  • To determine the agreement between CLOCK CHART(®) results and standard visual field testing.

Main Methods:

  • 114 glaucoma patients and 45 normal individuals were tested using CLOCK CHART(®).
  • Static visual fields were obtained using Octopus 101 G2 and classified by Greve stages and mean defect (MD).
  • Sensitivity, specificity, and agreement of CLOCK CHART(®) were evaluated across different visual field zones and glaucoma severities.

Main Results:

  • CLOCK CHART(®) showed high sensitivity for detecting visual field abnormalities in all glaucoma stages (85-100% for Greve stages, 87-97% for MD).
  • Agreement between CLOCK CHART(®) and static fields was strong (85-100% for Greve stages, 91-96% for MD).
  • The specificity of CLOCK CHART(®) was 89%.

Conclusions:

  • CLOCK CHART(®) is a simple and reliable self-check screening tool.
  • It is effective in detecting visual field abnormalities in patients with glaucoma.
  • CLOCK CHART(®) shows promise for widespread clinical use in glaucoma screening.