Poster 14

by in  Poster Session 1

New Developed 4 Dot Light Test Mobile Application  

Rosario Gómez-de-Liaño, MD, PhD; Maria Nieves-Moreno, MD; Laura Morales-Fernández, MD, PhD
Hospital Clínico San Carlos


Introduction: To present a newly developed mobile application to evaluate the 4 Dot Light test in children, that could be more versatile and also be able to evaluate the sustained fusion angle at different distances.

Methods: The new application has both pediatric and adult images with different sizes to evaluate the sustained angle, a version with 3 and 4 images, changes on the test to avoid memorization and sounds to implement the use in smaller children. We compared this new device with the projector 4WLT in 23 adults.

Results: We present the mathematical values of the sustained angle of the test when used from 5 meters to 20 centimeters, and the estimated value of peripheral, macular and foveal fusion. 82,61% and 86,96% of the patients had distance foveal fusion with the projector and the mobile app device respectively, and 17,39% and 13,04% had macular fusion. The concordance between the projector and the app was k = 0,832.

Discussion: The 4 Dot Light mobile application has a high correlation with the standard projector 4WLT.

Conclusion: The new Worth Test mobile application could be useful in the daily practice to measure foveal, macular andperipheral sustained fusion angles both in children and adults.


  1. Worth C. Squint: Its causes, pathology and treatment. Philadelphia: Blakiston, 1908.
  2. Arthur, B. W., Marshall, A., McGillivray, D. (1993). Worth vs Polarise Four-Dot Test. Journal of Paediatric Ophthalmology and Strabismus, 30(1), 53-55.
  3. Roper-Hall,G.(2004). The “Worth” of the Worth Four Dot Test. American Orthoptic Journal, 51,115
  4. American Academy of Ophthalmology (2014). Worth’s 4-Dot Test Retrieved
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