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[Options and limits of visual function tests available on the internet].

J Kuchenbecker1, H Lindner, W Behrens-Baumann

  • 1Universitäts-Augenklinik Magdeburg, Germany. joern.kuchenbecker@medizin.uni-magdeburg.de

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|November 14, 2002
PubMed
Summary

Online visual function tests show significant variability and deficits, questioning their reliability for screening. Standardization and further studies are needed to ensure accurate internet-based vision testing.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Human Visual System

Background:

  • Visual system quantitative capabilities can be assessed using defined graphic presentations.
  • The internet offers an increasing number of visual function tests, accessible to millions globally.
  • These online tests cater to diverse user hardware and software requirements.

Purpose of the Study:

  • To evaluate the characteristics and reliability of online visual acuity and color vision tests.
  • To identify limitations and variability in internet-based vision testing methodologies.

Main Methods:

  • A systematic search identified 38 online visual acuity and 19 online color vision tests on German websites.
  • Data collected included test provider, chart type, test conditions, and hardware/software adjustments.

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  • Analysis focused on the variability and programming complexity of the online tests.

    • Main Results:

    • Online tests for visual acuity, Amsler grid, stereo, and color vision are available, varying from simple displays to interactive programs.
    • Most tests are offered by the optical industry and opticians.
    • Significant variability in test conditions, such as lighting and monitor calibration, was noted, with color presentation issues prevalent.

    Conclusions:

    • Deficits in online visual function tests render their results questionable for diagnostic purposes.
    • Inconsistent data on test conditions and lack of standardization limit the reliability of current internet-based vision tests.
    • Development of standards and further research are crucial to validate these tests for screening applications.