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Accommodative Behavior, Hyperopic Defocus, and Retinal Image Quality in Children Viewing Electronic Displays.

Raman Prasad Sah1, Viswanathan Ramasubramanian, Olivia Reed

  • 1School of Optometry, Indiana University, Bloomington, Indiana.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 25, 2020
PubMed
Summary
This summary is machine-generated.

Children viewing electronic devices experience mild hyperopic defocus, similar to other stimuli. This study found that modern screens do not cause unusually high levels of visual strain in young users.

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Area of Science:

  • Ophthalmology
  • Pediatric Eye Care
  • Visual Science

Background:

  • Myopia prevalence and electronic display use in children are increasing.
  • Understanding visual responses to digital devices is crucial for pediatric eye health.

Purpose of the Study:

  • To compare the accommodative behavior of nonmyopic and myopic children while viewing computer screens and mobile phones.

Main Methods:

  • Examined accommodative behavior in 19 children (11 nonmyopic, 8 myopic) using an open-field autorefractor.
  • Presented various stimuli (scaled/nonscaled, text/movie) on LCD monitors and iPhones under different lighting and viewing conditions (monocular/binocular).

Main Results:

  • All children exhibited accommodative lag at typical reading distances (20-33 cm).
  • Lower accommodative slopes were observed in nonmyopic children under low room lighting, with nonscaled targets, and during monocular viewing.
  • Nonmyopic children showed larger accommodative lags than myopic children, especially at 33 cm when viewing nonscaled stimuli binocularly.

Conclusions:

  • Children viewing handheld electronic devices exhibit small amounts of hyperopic defocus (≤0.50 D), with nonmyopes showing slightly more than myopes.
  • Current electronic devices do not appear to induce unusually high levels of hyperopic defocus in children.