Decades of Research. One Practical Implementation Tool.
illumable translates peer-reviewed evidence on outdoor light exposure and myopia prevention into measurable family compliance.
What the Research Shows
50%
Reduced Myopia Onset
Randomised controlled trials show outdoor time can reduce new myopia cases by up to 50%.
2 hrs
Daily Threshold
Meta-analyses consistently identify ~2 hours of daily outdoor time as the protective threshold.
5B
Affected by 2050
Half the world's population projected to be myopic by 2050 without intervention.
Key References
Studies supporting outdoor light exposure for myopia prevention, sleep, mental wellbeing, and physical health.
Prevention - Randomised Controlled Trials
Effect of time spent outdoors at school on the development of myopia among children in China: a randomized clinical trial
He M, Xiang F, Zeng Y, Mai J, Chen Q, Zhang J, Smith W, Rose K, Morgan IG
JAMA 2015;314(11):1142-1148
doi: 10.1001/jama.2015.10803Outdoor activity during class recess reduces myopia onset and progression in school children
Wu PC, Tsai CL, Wu HL, Yang YH, Kuo HK
Ophthalmology 2013;120(5):1080-1085
doi: 10.1016/j.ophtha.2012.11.009Myopia prevention and outdoor light intensity in a school-based cluster randomized trial
Wu PC, Chen CT, Lin KK, Sun CC, Kuo CN, Huang HM, Poon YC, Yang ML, Chen CY, Huang JC, Wu PC, Yang IH, Yu HJ, Fang PC, Tsai CL, Chiou ST, Yang YH
Ophthalmology 2018;125(8):1239-1250
doi: 10.1016/j.ophtha.2017.12.011Time outdoors in reducing myopia: a school-based cluster randomized trial with objective monitoring of outdoor time and light intensity
He X, Sankaridurg P, Wang J, Chen J, Naduvilath T, He M, Zhu J, Li W, Morgan IG, Xiong S, Rose K, Weng R, Resnikoff S, Xu X
Ophthalmology 2022;129(11):1245-1254
doi: 10.1016/j.ophtha.2022.06.024Wearable-Based Monitoring Evidence
Smartwatch measures of outdoor exposure and myopia in children
Chen J, Cao K, Hu Y, Wan Y, He X, Xu X
JAMA Network Open 2024;7(8):e2424595
doi: 10.1001/jamanetworkopen.2024.24595Development of the FitSight fitness tracker to increase time outdoors to prevent myopia
Verkicharla PK, Ramamurthy D, Nguyen QD, Zhang X, Pu SH, Malhotra R, Ostbye T, Lamoureux EL, Saw SM
Translational Vision Science & Technology 2017;6(3):20
doi: 10.1167/tvst.6.3.20Association of time outdoors and patterns of light exposure with myopia in children
Li M, Lanca C, Tan CS, Foo LL, Sun CH, Yap F, Najjar RP, Sabanayagam C, Saw SM
British Journal of Ophthalmology 2023;107(1):133-139
doi: 10.1136/bjophthalmol-2021-318918Light exposure and eye growth in childhood
Read SA, Collins MJ, Vincent SJ
Investigative Ophthalmology & Visual Science 2015;56(11):6779-6787
doi: 10.1167/iovs.14-15978Dose-Response Evidence & Meta-Analyses
Time spent in outdoor activities in relation to myopia prevention and control: a meta-analysis and systematic review
Xiong S, Sankaridurg P, Naduvilath T, Zang J, Zou H, Zhu J, Lv M, He X, Xu X
Acta Ophthalmologica 2017;95(6):551-566
doi: 10.1111/aos.13403Is spending more time outdoors able to prevent and control myopia in children and adolescents? A meta-analysis
Yang Y, Li R, Ge L, Zeng L
Ophthalmic Research 2024;67(1):393-404
doi: 10.1159/000539229Significance of outdoor time for myopia prevention: a systematic review and meta-analysis based on randomized controlled trials
Cao K, Wan Y, Yusufu M, Wang N
Ophthalmic Research 2020;63(2):97-105
doi: 10.1159/000501937Time spent outdoors as an intervention for myopia prevention and control in children: an overview of systematic reviews
Dhakal R, Lawrenson JG, Huntjens B, Shah R, Verkicharla PK
Ophthalmic and Physiological Optics 2022;42(3):545-558
doi: 10.1111/opo.12945Efficacy of outdoor interventions for myopia in children and adolescents: a systematic review and meta-analysis of randomized controlled trials
Chen Y, Li X, Zhang Y, et al.
Frontiers in Public Health 2024;12:1452567
doi: 10.3389/fpubh.2024.1452567The association between time spent outdoors and myopia in children and adolescents: a systematic review and meta-analysis
Sherwin JC, Reacher MH, Keogh RH, Khawaja AP, Mackey DA, Foster PJ
Ophthalmology 2012;119(10):2141-2151
doi: 10.1016/j.ophtha.2012.04.020Effect of outdoor activities in myopia control: meta-analysis of clinical studies
Deng L, Pang Y
Optometry and Vision Science 2019;96(4):276-282
doi: 10.1097/OPX.0000000000001357Long-Term Outcomes
Time spent outdoors in childhood is associated with reduced risk of myopia as an adult
Lingham G, Yazar S, Lucas RM, Milne E, Hewitt AW, Hammond CJ, MacGregor S, Rose KA, Chen FK, He M, Guggenheim JA, Mackey DA
Scientific Reports 2021;11:6337
doi: 10.1038/s41598-021-85825-yTime spent outdoors in childhood related to myopia among young adults in the Swedish ABIS cohort
Bro T, Ludvigsson J
Acta Ophthalmologica 2024;103(2):171-176
doi: 10.1111/aos.16688IMI Consensus Reports
IMI – Interventions for controlling myopia onset and progression report
Wildsoet CF, Chia A, Cho P, Guggenheim JA, Polling JR, Read S, Sankaridurg P, Saw SM, Trier K, Walline JJ, Wu PC, Wolffsohn JS
Investigative Ophthalmology & Visual Science 2019;60(3):M106-M131
doi: 10.1167/iovs.18-25958IMI 2024 Digest: The role of light in refractive development and myopia
Ashby R, Harb EN, Reilly MA, Read SA, Smith EL
Investigative Ophthalmology & Visual Science 2025;66(15):5
doi: 10.1167/iovs.66.15.5Epidemiological Landmark Studies
Outdoor activity reduces the prevalence of myopia in children
Rose KA, Morgan IG, Ip J, Kifley A, Huynh S, Smith W, Mitchell P
Ophthalmology 2008;115(8):1279-1285
doi: 10.1016/j.ophtha.2007.12.019Time outdoors and physical activity as predictors of incident myopia in childhood: a prospective cohort study
Guggenheim JA, Northstone K, McMahon G, Ness AR, Deere K, Mattocks C, Pourcain BS, Williams C
Investigative Ophthalmology & Visual Science 2012;53(6):2856-2865
doi: 10.1167/iovs.11-9091Risk factors for incident myopia in Australian schoolchildren: the Sydney Adolescent Vascular and Eye Study
French AN, Morgan IG, Mitchell P, Rose KA
Ophthalmology 2013;120(10):2100-2108
doi: 10.1016/j.ophtha.2013.02.035Parental history of myopia, sports and outdoor activities, and future myopia
Jones LA, Sinnott LT, Mutti DO, Mitchell GL, Moeschberger ML, Zadnik K
Investigative Ophthalmology & Visual Science 2007;48(8):3524-3532
doi: 10.1167/iovs.06-1118Global Prevalence & Public Health
Global prevalence of myopia and high myopia and temporal trends from 2000 through 2050
Holden BA, Fricke TR, Wilson DA, Jong M, Naidoo KS, Sankaridurg P, Wong TY, Naduvilath TJ, Resnikoff S
Ophthalmology 2016;123(5):1036-1042
doi: 10.1016/j.ophtha.2016.01.006The epidemics of myopia: aetiology and prevention
Morgan IG, French AN, Ashby RS, Guo X, Ding X, He M, Rose KA
Progress in Retinal and Eye Research 2018;62:134-149
doi: 10.1016/j.preteyeres.2017.09.004Mechanism — Light, Dopamine & Optical Pathways
The effect of bright light on lens compensation in chicks
Ashby RS, Schaeffel F
Investigative Ophthalmology & Visual Science 2010;51(10):5247-5253
doi: 10.1167/iovs.09-4689The complex interactions of retinal, optical and environmental factors in myopia aetiology
Flitcroft DI
Progress in Retinal and Eye Research 2012;31(6):622-660
doi: 10.1016/j.preteyeres.2012.06.004How does spending time outdoors protect against myopia? A review
Lingham G, Mackey DA, Lucas R, Yazar S
British Journal of Ophthalmology 2020;104(5):593-599
doi: 10.1136/bjophthalmol-2019-314675Light Measurement & Sun Protection
Patterns of daily outdoor light exposure in Australian and Singaporean children
Read SA, Vincent SJ, Tan CS, Ngo C, Collins MJ, Saw SM
Translational Vision Science & Technology 2018;7(3):8
doi: 10.1167/tvst.7.3.8The effects of different outdoor environments, sunglasses and hats on light levels: implications for myopia prevention
Lanca C, Teo A, Vivagandan A, Htoon HM, Najjar RP, Spiegel DP, Pu SH, Saw SM
Translational Vision Science & Technology 2019;8(4):7
doi: 10.1167/tvst.8.4.7Prediction & Risk Assessment
Prediction of juvenile-onset myopia
Zadnik K, Sinnott LT, Cotter SA, Jones-Jordan LA, Kleinstein RN, Manny RE, Twelker JD, Mutti DO; CLEERE Study Group
JAMA Ophthalmology 2015;133(6):683-689
doi: 10.1001/jamaophthalmol.2015.0471Biomarkers of Outdoor Exposure
The association between time spent outdoors and myopia using a novel biomarker of outdoor light exposure
Sherwin JC, Hewitt AW, Coroneo MT, Kearns LS, Griffiths LR, Mackey DA
Investigative Ophthalmology & Visual Science 2012;53(8):4363-4370
doi: 10.1167/iovs.11-8677Behavioural Science & Additional Evidence
Objectively measured light exposure in emmetropic and myopic adults
Ostrin LA
Optometry and Vision Science 2017;94(2):229-238
doi: 10.1097/OPX.0000000000001013Light levels, refractive development, and myopia — a speculative review
Norton TT, Siegwart JT
Experimental Eye Research 2013;114:48-57
doi: 10.1016/j.exer.2013.05.004An updated view on the role of dopamine in myopia
Feldkaemper M, Schaeffel F
Experimental Eye Research 2013;114:106-119
doi: 10.1016/j.exer.2013.02.007Increased time outdoors is followed by reversal of the long-term trend to reduced visual acuity in Taiwan primary school students
Wu PC, Chen CT, Chang LC, Niu YZ, Chen ML, Liao LL, Rose K, Morgan IG
Ophthalmology 2020;127(11):1462-1469
doi: 10.1016/j.ophtha.2020.01.054Myopia, lifestyle, and schooling in students of Chinese ethnicity in Singapore and Sydney
Rose KA, Morgan IG, Smith W, Burlutsky G, Mitchell P, Saw SM
Archives of Ophthalmology 2008;126(4):527-530
doi: 10.1001/archopht.126.4.527Sleep
Time spent in outdoor light is associated with mood, sleep, and circadian rhythm-related outcomes: a cross-sectional and longitudinal study in over 400,000 UK Biobank participants
Burns AC, Saxena R, Vetter C, Phillips AJK, Lane JM, Cain SW
Journal of Affective Disorders 2021;295:347-352
doi: 10.1016/j.jad.2021.08.056Associations of outdoor play and screen time with nocturnal sleep duration and pattern among young children
Xu H, Wen LM, Hardy LL, Rissel C
Acta Paediatrica 2016;105(3):297-303
doi: 10.1111/apa.13285Associations of light exposure patterns with sleep among Dutch children: the ABCD cohort study
Stefanopoulou M, Ruhé N, Portengen L, van Wel L, Vrijkotte TGM, Vermeulen R, Huss A
Journal of Sleep Research 2024;33(6):e14184
doi: 10.1111/jsr.14184Mental Wellbeing
Nature and children's health: a systematic review
Fyfe-Johnson AL, Hazlehurst MF, Perrins SP, Bratman GN, Thomas R, Garrett KA, Hafferty KR, Cullaz TM, Marcuse EK, Tandon PS
Pediatrics 2021;148(4):e2020049155
doi: 10.1542/peds.2020-049155Outdoor time, physical activity, sedentary time, and health indicators at ages 7 to 14: 2012/2013 Canadian Health Measures Survey
Larouche R, Garriguet D, Gunnell KE, Goldfield GS, Tremblay MS
Health Reports 2016;27(9):3-13
doi: 27655167Mental health benefits of interactions with nature in children and teenagers: a systematic review
Tillmann S, Tobin D, Avison W, Gilliland J
Journal of Epidemiology and Community Health 2018;72(10):958-966
doi: 10.1136/jech-2018-210436Physical Health
What is the relationship between outdoor time and physical activity, sedentary behaviour, and physical fitness in children? A systematic review
Gray C, Gibbons R, Larouche R, Sandseter EBH, Bienenstock A, Brussoni M, Chabot G, Herrington S, Janssen I, Pickett W, Power M, Stanger N, Sampson M, Tremblay MS
International Journal of Environmental Research and Public Health 2015;12(6):6455-6474
doi: 10.3390/ijerph120606455Outdoor time is associated with physical activity, sedentary time, and cardiorespiratory fitness in youth
Schaefer L, Plotnikoff RC, Majumdar SR, Mollard R, Woo M, Sadman R, Rinaldi RL, Boulé N, Torrance B, Ball GDC, Veugelers P, Wozny P, McCargar L, Downs S, Lewanczuk R, Gleddie D, McGavock J
The Journal of Pediatrics 2014;165(3):516-521
doi: 10.1016/j.jpeds.2014.05.029A prospective examination of children's time spent outdoors, objectively measured physical activity and overweight
Cleland V, Crawford D, Baur LA, Hume C, Timperio A, Salmon J
International Journal of Obesity 2008;32(11):1685-1693
doi: 10.1038/ijo.2008.171Updated February 2026