This site provides general eye-health education. It cannot replace individual assessment by a registered doctor, and does not offer personal diagnosis, prescriptions, bookings, sales or referrals.
If translations differ or are incomplete, the Traditional Chinese (zh-Hant) text on this site prevails.
Not a medical device, and not a myopia-progress report. Mainly public-health evidence for primary-school-age children: about two hours or more of outdoor natural light a day is linked with lower myopia incidence / delayed onset (population-level evidence, not a personal guarantee). Indoor lighting does not replace daylight.
If a child already has myopia, outdoor daylight may help slow progression, but it cannot replace options an ophthalmologist may discuss after examination — and this tool is not a personal progress report.
Based on school-based outdoor-activity randomised trials and recent meta-analyses (population level).
Daylight (outdoors)
Shade, playgrounds and walking to school count. Sunglasses still admit daylight.
Indoor light
Classrooms, tutorial centres and phone screens do not count toward these two hours.
Outdoor daylight logged today (a public-health round number, not your child’s prescription)
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Childhood myopia: options a doctor may discussA demonstration is not an examination and cannot replace dilated fundus exam, visual field or OCT. A normal result here does not rule out disease. New changes need prompt review by a registered ophthalmologist; sudden vision loss — go to A&E. This site does not book or refer.