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Way more kids have fuzzy vision these days because we spend less time in outdoor light, which makes our eyeballs longer.
To learn more about this topic, start your googling with these keywords:
– Lens: A transparent biconvex structure in the eye that can change its shape to change the focal distance.
– Retina: A layer at the back of the eyeball containing cells that are sensitive to light.
– Fovea: A small depression in the retina where visual acuity is highest.
– Myopia: A common vision condition in which distant objects are blurry.
– Hyperopia: A vision condition in which nearer objects are blurry.
– Emmetropization: The process by which the eye grows in order to maximize visual acuity.
– Dopamine: A neurotransmitter in the retina that tells the eyeball to stop growing once it has gotten to the ideal length.
– Near Work Hypothesis: The theory that the modern myopia epidemic was a result of humans spending more time looking at nearby objects.
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Zhou, X., Pardue, M. T., Iuvone, P. M., & Qu, J. (2017). Dopamine signaling and myopia development: What are the key challenges. Progress in retinal and eye research, 61, 60–71. Retrieved from: https://doi.org/10.1016/j.preteyeres.2017.06.003
Morgan, I. G., Rose, K. A., Ellwein, L. B., & Refractive Error Study in Children Survey Group (2010). Is emmetropia the natural endpoint for human refractive development? An analysis of population-based data from the refractive error study in children (RESC). Acta ophthalmologica, 88(8), 877–884. Retrieved from: https://doi.org/10.1111/j.1755-3768.2009.01800.x
Dolgan, E. (2015). The Myopia Boom. Nature. 519: 276-278. Retrieved from: https://www.nature.com/news/polopoly_fs/1.17120!/menu/main/topColumns/topLeftColumn/pdf/519276a.pdf
Carr BJ, Stell WK. The Science Behind Myopia. (2017) In: Kolb H, Fernandez E, Nelson R, editors. Webvision: The Organization of the Retina and Visual System [Internet]. Salt Lake City (UT): University of Utah Health Sciences Center; 1995-. Retrieved from: https://www.ncbi.nlm.nih.gov/books/NBK470669/
Brody, J. (2021). Why Nearsightedness is on the Rise in Children. New York Times. Retrieved from: https://www.nytimes.com/2021/05/03/well/live/nearsightedness-myopia-children.html
Klaver CCW, Polling JR, Enthoven CA. (2021) 2020 as the Year of Quarantine Myopia. JAMA Ophthalmol. 2021;139(3):300–301. Retrieved from: doi:10.1001/jamaophthalmol.2020.6231