Online Circular Contrast Perimetry: Validity and Repeatability of Home Performance

Area of Science:

• Ophthalmology
• Medical Technology
• Digital Health

Background:

• Online Circular Contrast Perimetry (OCCP) is a web-based tool for threshold perimetry.
• Its feasibility, repeatability, and reliability in unsupervised home settings need evaluation.

Purpose of the Study:

• To assess the feasibility, repeatability, and reliability of OCCP when used by patients in unsupervised home environments on personal devices.
• To compare home-based OCCP performance with clinic-based testing.

Main Methods:

• 55 participants (20 control, 35 glaucoma patients) completed baseline clinic tests and 6 weeks of weekly home tests.
• Visual field indices and reliability metrics were compared between settings.
• Rasch analysis evaluated psychometric properties and intergroup variability.

Main Results:

• No significant differences in mean deviation (MD) or pattern standard deviation (PSD) between home and clinic tests.
• High test-retest reliability (ICC for MD: 0.90-0.93; PSD: 0.81-0.85).
• Higher false positive and fixation loss rates at home; high user satisfaction but suboptimal Rasch analysis results.

Conclusions:

• OCCP demonstrates comparable diagnostic accuracy and repeatability in home settings versus clinical environments.
• OCCP is a feasible remote tool for glaucoma screening and surveillance.
• Further refinement may be needed based on Rasch analysis findings.