Myopia occurs when the eye length (or axial length) exceeds the normal range. While individuals with myopia can see objects up close, distant targets appear blurry, the extent of which depends on the degree of myopia. The prevalence of myopia is on the rise, possibly due to increased indoor activities.
The primary preventive measure against myopia, also known as nearsightedness, is spending time outdoors. Research indicates that an additional 76 minutes of outdoor time daily can provide a 50% protective effect against developing nearsightedness. The recommended minimum daily outdoor exposure is two hours, even if it’s rainy or cloudy.
Although the exact reasons behind the protective effect of outdoor time on myopia onset are not fully understood, several theories warrant further investigation. Factors such as high light levels have been associated with reduced axial elongation, possibly linked to the release of dopamine, known to inhibit ocular growth and lessen myopic progression.
Additionally, specific light exposure, particularly shorter wavelengths found in outdoor light, has demonstrated the ability to prevent myopia. The increased absorption of Vitamin D during outdoor activities may also contribute to reducing the risk of myopia onset.
While the impact of outdoor time on the progression of myopia in already nearsighted children remains unclear, the numerous mental and physical benefits associated with outdoor play make it an essential component of daily routines.
In summary, make it a habit to incorporate outdoor play into your daily life. Aim for at least two hours of outdoor time each day to support your eye health and overall well-being.
Protect their eyes with the power of outdoor play.
Aim for two hours outside every day!
References:
- Ly, Angelica, and Michael Morton. “How Much Outdoor Time Do Children Require?” Review of Myopia Management, 1 July 2022, https://reviewofmm.com/how-much-outdoor-time-do-children-require/.
- Zhang J, Deng G. Protective effects of increased outdoor time against myopia: a review. J Int Med Res. 2020 Mar;48(3):300060519893866. doi: 10.1177/0300060519893866. Epub 2019 Dec 19. PMID: 31854216; PMCID: PMC7607527.
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