Light Exposure Profiles Differ Between Myopes and Non-myopes Outside School Hours

Overview

Journal BMJ Open Ophthalmol

Specialty Ophthalmology

Date 2024 May 30

PMID 38816010

Authors

Rohit Dhakal

John G Lawrenson

Byki Huntjens

Rakhee Shah

Pavan Kumar Verkicharla

Affiliations

Soon will be listed here.

Abstract

Purpose: Considering the putative role of light in myopia, and variations in socioeconomic, lifestyle, educational and environmental factors across ethnicities, we objectively investigated light exposure patterns in Indian school children.

Methods: The light exposure profile of 143 school children (9-15 years, 50 myopes) recorded using a validated wearable light tracker for six continuous days was analysed. Additional data for non-school days were available for 87 children (26 myopes). The illuminance exposure levels, time spent outdoors and epoch (number of times participant is exposed to a predefined range of lux level per day) were compared between myopes and non-myopes across different light conditions: ≥1000, ≥3000, ≥5000 and ≥10 000 lux. For school days, light exposure profiles during (1) before school, school and after school hours; and (2) class, break and transition (when a student travels to and from school) time were analysed.

Results: The overall median (IQR) daily illuminance exposure level, time spent outdoors and epochs at outdoors (≥1000 lux) were 807 (507-1079) lux/day, 46 (30-64) min/day and 9 (6-12) times/day, respectively. The daily illuminance exposure on non-school days was significantly higher in non-myopes than myopes (6369 (4508-9112) vs 5623 (2616-6929) lux/day, p=0.04). During transition time (school days), non-myopes had significantly higher illuminance exposure (910 (388-1479) vs 550 (263-1098) lux/day, p=0.04), spent more time outdoors (25 (10-43) vs 14 (4-29) min/day, p=0.01) and had higher outdoor epochs (6 (4-11) vs 5 (2-8) times/day, p=0.01) than myopes.

Conclusions: A small but significant difference in illuminance exposure, time spent outdoors and epoch was noted between myopes and non-myopes during transition time, which may have implications in myopia control.

References

Lan W, Feldkaemper M, Schaeffel F . Intermittent episodes of bright light suppress myopia in the chicken more than continuous bright light. PLoS One. 2014; 9(10):e110906. PMC: 4216005. DOI: 10.1371/journal.pone.0110906. View

Foulds W, Barathi V, Luu C . Progressive myopia or hyperopia can be induced in chicks and reversed by manipulation of the chromaticity of ambient light. Invest Ophthalmol Vis Sci. 2013; 54(13):8004-12. DOI: 10.1167/iovs.13-12476. View

Karthikeyan S, Ashwini D, Priyanka M, Nayak A, Biswas S . Physical activity, time spent outdoors, and near work in relation to myopia prevalence, incidence, and progression: An overview of systematic reviews and meta-analyses. Indian J Ophthalmol. 2022; 70(3):728-739. PMC: 9114537. DOI: 10.4103/ijo.IJO_1564_21. View

Muralidharan A, Lanca C, Biswas S, Barathi V, Wan Yu Shermaine L, Seang-Mei S . Light and myopia: from epidemiological studies to neurobiological mechanisms. Ther Adv Ophthalmol. 2022; 13:25158414211059246. PMC: 8721425. DOI: 10.1177/25158414211059246. View

Howell C, McCullough S, Doyle L, Murphy M, Saunders K . Reliability and validity of the Actiwatch and Clouclip for measuring illumination in real-world conditions. Ophthalmic Physiol Opt. 2021; 41(5):1048-1059. DOI: 10.1111/opo.12860. View

Huang H, Chang D, Wu P . The Association between Near Work Activities and Myopia in Children-A Systematic Review and Meta-Analysis. PLoS One. 2015; 10(10):e0140419. PMC: 4618477. DOI: 10.1371/journal.pone.0140419. View

Landis E, Yang V, Brown D, Pardue M, Read S . Dim Light Exposure and Myopia in Children. Invest Ophthalmol Vis Sci. 2018; 59(12):4804-4811. PMC: 6181186. DOI: 10.1167/iovs.18-24415. View

Wen L, Cao Y, Cheng Q, Li X, Pan L, Li L . Objectively measured near work, outdoor exposure and myopia in children. Br J Ophthalmol. 2020; 104(11):1542-1547. PMC: 7587221. DOI: 10.1136/bjophthalmol-2019-315258. View

Dhakal R, Shah R, Huntjens B, Verkicharla P, Lawrenson J . Time spent outdoors as an intervention for myopia prevention and control in children: an overview of systematic reviews. Ophthalmic Physiol Opt. 2022; 42(3):545-558. PMC: 9305934. DOI: 10.1111/opo.12945. View

10.

Li M, Lanca C, Tan C, Foo L, Sun C, Yap F . Association of time outdoors and patterns of light exposure with myopia in children. Br J Ophthalmol. 2021; 107(1):133-139. DOI: 10.1136/bjophthalmol-2021-318918. View

11.

Dhakal R, Rudrapankte J, Chittajallu H, Lawrenson J, Huntjens B, Shah R . Development and validation of a 'MyLyt' wearable light tracking device. Ophthalmic Physiol Opt. 2022; 43(1):132-140. DOI: 10.1111/opo.13061. View

12.

Lingham G, Mackey D, Lucas R, Yazar S . How does spending time outdoors protect against myopia? A review. Br J Ophthalmol. 2019; 104(5):593-599. DOI: 10.1136/bjophthalmol-2019-314675. View

13.

Alvarez A, Wildsoet C . Quantifying light exposure patterns in young adult students. J Mod Opt. 2014; 60(14):1200-1208. PMC: 4204734. DOI: 10.1080/09500340.2013.845700. View

14.

Read S, Collins M, Vincent S . Light Exposure and Eye Growth in Childhood. Invest Ophthalmol Vis Sci. 2015; 56(11):6779-87. DOI: 10.1167/iovs.14-15978. View

15.

Long Q, Chen D, Chu R . Illumination with monochromatic long-wavelength light promotes myopic shift and ocular elongation in newborn pigmented guinea pigs. Cutan Ocul Toxicol. 2009; 28(4):176-80. DOI: 10.3109/15569520903178364. View

16.

Biswas S, El Kareh A, Qureshi M, Lee D, Sun C, Lam J . The influence of the environment and lifestyle on myopia. J Physiol Anthropol. 2024; 43(1):7. PMC: 10829372. DOI: 10.1186/s40101-024-00354-7. View

17.

Philip K, Sankaridurg P, Naduvilath T, Konda N, Bandamwar K, Kanduri S . Prevalence and Patterns of Refractive Errors in Children and Young Adults in an Urban Region in South India: the Hyderabad Eye Study. Ophthalmic Epidemiol. 2022; 30(1):27-37. DOI: 10.1080/09286586.2022.2032202. View

18.

Saxena R, Vashist P, Tandon R, Pandey R, Bhardawaj A, Menon V . Prevalence of myopia and its risk factors in urban school children in Delhi: the North India Myopia Study (NIM Study). PLoS One. 2015; 10(2):e0117349. PMC: 4342249. DOI: 10.1371/journal.pone.0117349. View

19.

Feldkaemper M, Schaeffel F . An updated view on the role of dopamine in myopia. Exp Eye Res. 2013; 114:106-19. DOI: 10.1016/j.exer.2013.02.007. View

20.

Wang J, He X, Xu X . The measurement of time spent outdoors in child myopia research: a systematic review. Int J Ophthalmol. 2018; 11(6):1045-1052. PMC: 6010376. DOI: 10.18240/ijo.2018.06.24. View