A new study suggests spending more time outside early in life may offer some protection against nearsightedness.
The European study authors suspect that additional exposure to the sun's ultraviolet B rays may play a role in reducing nearsightedness.
The condition is characterized by an inability to see clearly at a distance, also known as myopia.
The study authors wrote, "We found that higher annual lifetime UVB exposure, directly related to time outdoors and sunlight exposure, was associated with reduced odds of myopia.
They added, "Exposure to UVB between ages 14 and 29 years was associated with the highest reduction in odds of adult myopia.".