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A computerized version of the Lancaster red-green test.

Ahmed Awadein¹

¹Cairo University Faculty of Medicine, Cairo, Egypt. ahmedawadein@yahoo.com

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus

|April 30, 2013

Summary

This summary is machine-generated.

Computerized versions of the Lancaster red-green test show good agreement for vertical and torsional deviations. The projector-based system offers better agreement for horizontal deviations compared to the monitor version in strabismus patients.

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Area of Science:

Ophthalmology
Vision Science
Medical Technology

Background:

The Lancaster red-green test is a standard tool for measuring ocular deviations.
Assessing the accuracy and reliability of digital adaptations of established clinical tests is crucial for modern practice.

Purpose of the Study:

To compare the diagnostic accuracy of a computerized Lancaster red-green test against its conventional counterpart.
To evaluate two distinct computerized implementations: a monitor-based and a projector-based system.

Main Methods:

82 adult patients with noncomitant strabismus underwent testing with the conventional Lancaster red-green test and two computerized versions.
Agreement was assessed using Bland-Altman plots, mountain plots, and Deming regression for horizontal, vertical, and torsional deviations.
Testing distances varied: 50 cm for the monitor and 1 meter for the projector.

Main Results:

Both computerized versions demonstrated good agreement with the conventional test for vertical (<5Δ) and torsional (<3°) deviations.
The projector-based system showed superior agreement for horizontal deviations compared to the monitor-based system.
Agreement was consistent between the right and left eyes for all measurements.

Conclusions:

Computerized Lancaster red-green testing is a viable alternative for assessing vertical and torsional deviations.
The projector-based computerized system is recommended for measuring horizontal deviations in strabismus due to better agreement.
Digitalization of ophthalmic tests like the Lancaster red-green test enhances clinical utility and data analysis.