Scientists Say Half the World Could Be Nearsighted by 2050, and It’s Not Just Screens. This Indoor Habit May Be Why
Indian Defence Review • • health
Key Points:
- Nearsightedness (myopia) is rapidly increasing worldwide, with projections indicating nearly 50% of the global population affected by 2050 and rates nearing 90% among young adults in parts of East Asia.
- While genetics contribute, environmental factors—particularly increased indoor living and close-up tasks—are major drivers of the rise in myopia.
- Research shows screen time raises myopia risk, but recent studies reveal that visual strain is worsened by doing close-up work in dim lighting, which causes pupil constriction and reduces retinal illumination.
- Myopic eyes exhibit altered pupil and blinking responses, leading to prolonged constriction that may contribute to eyeball elongation and blurred distance vision.
- Increased outdoor time with exposure to natural light can help counteract myopia development, but declining outdoor activity among children and lifestyle changes limit the effectiveness of current treatments without behavioral adjustments.
