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Journal of Ophthalmology
Volume 2019, Article ID 1946073, 9 pages
Research Article

Novel Method of Remotely Monitoring the Face-Device Distance and Face Illuminance Using Mobile Devices: A Pilot Study

1Grupo de Ciencias de La Visión (CiViUM), Facultad de Óptica y Optometría, Universidad de Murcia, Murcia, Spain
2Clinical Optics Research Lab (CORL), Indiana University School of Optometry, Bloomington, IN, USA
3Clinical & Experimental Optometry Research Lab (CEORlab)—Center of Physics, University of Minho, Braga, Portugal

Correspondence should be addressed to Rosa María Salmerón-Campillo; moc.liamg@ollipmacnoremlasmr

Received 15 February 2019; Revised 21 April 2019; Accepted 13 May 2019; Published 11 June 2019

Guest Editor: Malgorzata Mrugacz

Copyright © 2019 Rosa María Salmerón-Campillo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Specially developed software (app) was written for handheld electronic devices that uses the device camera and light detector for real-time monitoring of near-work distance and environmental lighting. A pilot study of this novel app employed children using tablet computers in a classroom. Measurements of face-device distance and face illuminance were obtained from two schools where tablets were used regularly. Children were divided randomly into a control group (CG) and intervention group (IG). The app was calibrated in a lab and configured to store average values every 20 seconds in a remote database. In both groups, the app recorded data only when a child’s face was present in the camera image. The app darkened the screen for the IG when the face-device distance was shorter than 40 cm. The total mean face-device distance was 36.8 ± 5.7 cm in CG and 47.2 ± 6.5 cm in IG. Children in IG had to accommodate approximately 0.6 D less when using their devices. The mean classroom face illuminance was 980 ± 350 lux in School #1 and 750 ± 400 lux in School #2. The novel method of remotely monitoring and controlling the face-device distance and illuminance can potentially open new paths for myopia prevention and myopia control.