Near work, screens and daily habits
What helps, what is uncertain, and what does not work, so families can focus effort where it counts.
Close work
Studies link very close reading (under 30 cm) and long unbroken sessions with more myopia. The links are real but modest, and not every study agrees. Sensible habits cost nothing:
- Keep books and screens at least 30 to 40 cm from the eyes, about the length of the child's forearm.
- Take a break every 20 to 30 minutes and look at something far away. The popular 20-20-20 rule (every 20 minutes, look 20 feet away for 20 seconds) is practical; it has not been proven to slow myopia.
- Sit upright at a desk with good light, not lying down or on the bed.
- Use large print and good contrast to avoid leaning in.
Screens
More screen time goes with more myopia in many studies, but it is hard to separate from less time outdoors and more schoolwork. A cautious plan: keep recreational screen time modest, favour larger screens held further away, and make sure screens do not crowd out outdoor time. For young children, follow the World Health Organization's limits on sedentary screen time.
Light and sleep
- Bright, even lighting for reading is comfortable and helps children sit back.
- Regular, sufficient sleep is good for children's health generally. There is no strong proof that it changes myopia.
Glasses and everyday myths
- Full-strength glasses do not make eyes worse. Under-correcting does not slow myopia and may increase blur.
- Blue-light filtering glasses have not been shown to slow myopia.
- Eye exercises and vision therapy have not been shown to slow myopia.
- Diet and vitamins: no supplement has been proven to prevent or slow myopia.
- Eating healthy foods and staying active are good for children anyway.
The honest summary
Habits support treatment; they rarely replace it. If your child's myopia is already progressing, outdoor time and good habits help, and treatment such as defocus lenses, ortho-k, atropine or red light does the heavy lifting.