Young adults wearing the spectacle-mounted Clouclip device to measure viewing behaviour and light exposure also kept an activity diary. Mean daily near work and outdoor time were subjectively reported at about 150% of the objectively measured hours. This indicates the value of objective measures in research, as well as for clinical education and behaviour modification tools in future.
Light-emitting glasses worn by young adults for 1-2 hours reduced axial length and increased choroidal thickness by around 20 microns compared to darkness. The study participants viewed a colour-muted television at 5m while indoors, and the changes regressed within 30 minutes. A future myopia treatment to increase ‘outdoor’ time?
A country-wide intervention to increase outdoor time in 5-6 year olds resulted in the prevalence of myopia decreasing from 15% in the 2014 cohort (before the intervention) to 8% in 2016 cohort (exposed to the intervention for up to two years) and was stable for three years thereafter. Increasing outdoor time works!
There is general widespread accepted belief that increasing time spent outdoors can be protective against progression of myopia. Xiong et al set out to better understand the research by performing a meta-analysis of 51 clinical trials and longitudinal studies that investigated the relationship between time spent outdoors and the risk of either developing myopia, progression of existing myopia or a myopic shift in refractive error.
For many children using digital devices is a normal part of their everyday lives and they will use computers and hand-held devices at school and at home. This systematic review collates this published research to illuminate current understanding on the association between the time children spend on digital devices and incidence, prevalence or progression of myopia.
Children are accessing screens at school, around the home and for personal entertainment at younger and younger ages. At the same time, there has been an unprecedented increase in myopia in children, with higher numbers and earlier age of onset. Read about what we do and don’t know about this link; the impact of screen time on binocular vision and dry eye in kids, and guidelines for advice to parents.
The visual demand of concentrating on close-up tasks like reading and studying are thought to be a driving force for increased myopia in children. To better understand this relationship the authors consolidated data from several studies to quantify the effect of near work activities on myopia in children and discover any association there may be between them.