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Assessing the reliability of web-based measurements of visual function.

Richard J Leadbeater1, Paul McGraw2, Timothy Ledgeway2

  • 1Visual Neuroscience Group, School of Psychology, University of Nottingham, Nottingham, NG7 2RD, UK. richard.leadbeater@nottingham.ac.uk.

Behavior Research Methods
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Summary

Web-based experiments reliably measure visual cortical function, showing high agreement with lab tests. This validates remote testing for assessing the oblique effect and visual performance.

Keywords:
Oblique effectOrientation perceptionReliability and agreementRemote vision testingVisionWeb / lab comparisonWeb-based testing

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Area of Science:

  • Neuroscience
  • Vision Science
  • Psychology

Background:

  • Web-based experiments offer scalable replication of behavioral phenomena.
  • Validation of web-based versus lab-based objective measures is crucial for clinical and scientific adoption.
  • The oblique effect, an enhancement in visual discrimination for cardinal orientations, serves as a key indicator of early visual cortical function.

Purpose of the Study:

  • To investigate the reliability of web-based tasks for assessing early visual cortical function.
  • To evaluate the agreement between remote, web-based and traditional lab-based performance measures.
  • To examine the 'oblique effect' using both temporal and spatial orientation-identification tasks.

Main Methods:

  • Sixty-nine participants completed web-based, two-alternative forced choice (2AFC) orientation-identification tasks (temporal and spatial).
  • Orientation-identification thresholds were measured for cardinal (horizontal, vertical) and oblique orientations.
  • Reliability was assessed in 18 participants who repeated the tasks under laboratory conditions.

Main Results:

  • A robust oblique effect was observed, with lower thresholds for cardinal compared to oblique orientations in both web- and lab-based measures.
  • High levels of agreement were found between web-based and lab-based orientation-identification thresholds.
  • Both temporal and spatial 2AFC tasks demonstrated reliable measurement of the oblique effect.

Conclusions:

  • Web-based testing provides a reliable and valid method for assessing early visual cortical function.
  • The high agreement between web- and lab-based measures supports the use of remote testing for visual assessments.
  • Future research should explore the utility of these web-based tasks in clinical populations for screening and monitoring.