Exploring the Relationship Between Sleep and Myopia

By: Sreeja Surisetti

Introduction:

As the global prevalence of myopia continues upward, researchers are focused on an unexpected factor in vision—sleep. Recent studies have spotlighted the intricate relationship between sleep patterns, circadian rhythms, and the development of myopia. In this article, we explore how sleep influences myopia by reviewing potential implications for ocular health and the need for targeted preventive strategies. Let us explore the fascinating intersection of sleep and myopia.

The Behavioral Landscape of Myopia:

Before diving into the intricacies of the relationship between sleep and myopia, it's crucial to recognize the behavioral risk factors associated with myopia and its progression. Education and insufficient outdoor time have emerged as major contributors to childhood myopia across various studies, as explored in previous articles. As the world struggles with an escalating myopia crisis, researchers’ attention has turned to understanding the role of sleep in ocular health.

Sleep's Impact on Eye Health:

Sleep is foundational for children's overall health, and disruptions in sleep patterns, such as irregular sleep timing and short duration, are prevalent in children and young adults. Recent evidence links problematic sleep to myopia, with studies revealing associations with poor sleep quality, insufficient sleep duration, late bedtime, and delayed melatonin circadian timing [^5,^8–^10]. This raises questions about the potential impact of sleep-related factors on daytime sleepiness and myopia development.

Genetics, Circadian Rhythms, and Myopia:

The influence of genetics and circadian rhythms on myopia development has been a subject of growing interest. Studies dating back to the 1950s have underscored the importance of a regular light-dark cycle on eye development. Genetic factors involved in circadian entrainment, such as the Clock Gene, have been associated with abnormal ocular growth and myopia induction. Diurnal rhythms in ocular components, particularly axial length and choroidal thickness, further emphasize the intricate relationship between circadian rhythms and myopia.

Recent research has uncovered significant differences in refractive error and axial length diurnal changing patterns between late and early sleepers, suggesting that disrupted ocular rhythms may contribute to myopia development. Despite this research, a complete understanding of the mechanisms linking circadian rhythms, genetics, and myopia remains elusive.

Outdoor Time, Sleep, and Myopia:

While outdoor time is recognized as a protective factor against childhood myopia, the mechanisms behind its efficacy are still being explored. Hypotheses involving dopamine release, vitamin D levels, and spatial frequency compositions have been proposed. Considering sleep in this equation introduces a new perspective—outdoor activities can promote better sleep by regulating melatonin secretion, contributing to regular sleep onset in children. The link between sunlight exposure and myopia will be explored in a later article. 

Implications for Ocular Health Promotion:

In summary, the increasing evidence supporting the role of poor sleep and circadian rhythm disturbances in childhood myopia calls for a paradigm shift in pediatric myopia education and prevention. Guidelines emphasizing good sleep hygiene, including regular sleep timing and sufficient hours, should be prioritized in campaigns targeting children to help lower pediatric myopia cases. As researchers strive to address the escalating myopia crisis, understanding the complex relationships among sleep, circadian rhythms, and myopia is essential for developing effective preventive strategies and promoting optimal ocular health across the world.

Works Cited

Liu, Xiao Nicole, et al. “Sleeping Late Is a Risk Factor for Myopia Development amongst School-Aged Children in China.” Scientific Reports, vol. 10, no. 1, 14 Oct. 2020, https://doi.org/10.1038/s41598-020-74348-7.

MOptom, Xiao Nicole Liu. “The Role of Sleep in Childhood Myopia.” Review of Myopia Management, 1 Feb. 2023, reviewofmm.com/the-role-of-sleep-in-childhood-myopia/. Accessed 26 Nov. 2023.

Xiao Nicole Liu, et al. “Myopia and Sleep in Children—a Systematic Review.” Sleep, vol. 46, no. 11, 29 June 2023, https://doi.org/10.1093/sleep/zsad162. Accessed 19 Nov. 2023.