Orbicularis oculi muscle activity during computer reading under different degrees of artificially-induced aniseikonia
Metadata
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Redondo Cabrera, Beatriz; Vera Vílchez, Jesús; Molina Romero, Rubén; Molina Molina, Alejandro; Jiménez Rodríguez, RaimundoEditorial
PEERJ
Materia
Visual fatigue Orbicularis oculi muscle activity Aniseikonia
Date
2024-05-17Referencia bibliográfica
Redondo, B. et. al. PeerJ 12:e17293. [https://doi.org/10.7717/peerj.17293]
Abstract
Background. Aniseikonia is a binocular vision disorder that has been associated with
asthenopic symptoms. However, asthenopia has been evaluated with subjective tests
that make difficult to determine the level of aniseikonia. This study aims to objectively
evaluate the impact of induced aniseikonia at different levels on visual fatigue by
measuring the orbicularis oculi muscle activity in the dominant and non-dominant
eyes while performing a reading task.
Methods. Twenty-four collegiate students (24.00 3.86 years) participated in this
study. Participants read a passage for 7 minutes under four degrees of aniseikonia (0%,
3%, 5% and 10%) at 50 cm. Orbicularis oculi muscle activity of the dominant and nondominant
eye was recorded by surface electromyography. In addition, visual discomfort
was assessed after each task by completing a questionnaire.
Results. Orbicularis oculi muscle activity increased under induced aniseikonia (i.e.,
greater values for the 10% condition in comparison to 0%, and 3% conditions (p D
0:034 and pD0:023, respectively)). No statistically significant differences were observed
in orbicularis oculi muscle activity for the time on task and between the dominant and
non-dominant eyes. Additionally, higher levels of subjective visual discomfort were
observed for lower degrees of induced aniseikonia.
Conclusion. Induced aniseikonia increases visual fatigue at high aniseikonia degrees as
measured by the orbicularis oculi muscle activity, and at low degrees as measured with
subjective questionnaires. These findings may be of relevance to better understand the
visual symptomatology of aniseikonia.