Inverse dating between bed course and you can myopia


This population-based, cross-sectional study using a nationwide, systemic, stratified, multistage, clustered sampling method included a total of 3625 subjects aged 12–19 years who participated in the Korean National Health and Nutrition Examination Survey 2008–2012. All participants underwent ophthalmic examination and a standardized interview including average sleep duration (hr/day), education, physical activity and economic status (annual household income). Refractive error was measured by autorefraction without cycloplegia. Myopia and high myopia were defined as ??0.50 dioptres (D) and ??6.0 D, respectively. Sleep durations were classified into 5 categories: <5, 6, 7, 8 and >9 hr.


The overall prevalence of myopia and high myopia were 77.8% and 9.4%, respectively, and the overall sleep duration was 7.1 hr/day. The refractive error increased by 0.10 D per 1 hr increase in sleep after adjusting for potential confounders including sex, age, height, education level, economic status and physical activity. The adjusted odds ratio (OR) for refractive error was 0.90 (95% confidence interval [CI], 0.83–0.97) per 1 hr increase in sleep. The adjusted OR for myopia was decreased in those with >9 hr of sleep (OR, 0.59; 95% CI, 0.38–0.93; p for trend = 0.006) than in those with <5 hr of sleep. However, high myopia was not associated with sleep duration.


This research comes with the populace-created, epidemiologic facts to possess a keen inverse relationship ranging from bed years and you can myopia within the an agent people away from Korean teens.


Myopia the most preferred ocular ailment regarding visual interference around the globe (Morgan et al. 2012 ). The fresh new frequency out-of myopia try broadening in the a crisis rates, particularly in East Asia and you can South-Eastern Asia, and much more slowly when you look at the United states, European countries, Israel and you may Australian continent (Morgan & Flower 2013 ). The expenses pertaining to artwork disability due to myopia were correction away from refractive error via glasses, contact lenses and you may refractive surgery. While doing so, the brand new comorbidities and you will pathological consequences in the large myopia can result during the serious death of eyes and also blindness (Morgan ainsi que al. 2012 ). You’ll find after that personal can cost you with regards to death of efficiency on the myopia. Therefore, there’s an evergrowing significance of methods to prevent the start and you can advancement of myopia.

Chance factors to have myopia were generally investigated into the early in the day epidemiologic training (Pan et al. 2012 ). Near performs, studies, ages, financial standing and top had been seem to considered related that have myopia (Zhang mais aussi al. 2011 ; ). Recently, a heightened number of outdoor go out is actually demonstrated to has actually an excellent protective feeling up against myopia development in both get across-sectional training (Rose et al. 2008a , b ) and you will longitudinal studies (Jones et al. 2007 ; Jones-Jordan et al. 2011 ; Guggenheim ainsi que al. 2012 ). A couple of intervention research has claimed reductions during the myopia by the increasing big date external (Wu ainsi que al. 2013 ), and a good three-seasons school-depending input even offers said positive effects (Guggenheim et al. 2012 ). It was postulated that improved sunrays power outside increases dopamine release regarding the retina, which reduces eyes development, hence hypothesis has been confirmed when you look at the several laboratory studies on the experimental myopia pet (Gao ainsi que al. 2005 ; McCarthy et al. 2007 ; Stone et al. 2007 ; Feldkaemper & Schaeffel 2013 ).

You will find previously stated the newest extremely high frequency of myopia and you will high myopia in the younger communities from inside the metropolitan (Seoul, 96.5% and you may 21.6%, respectively) and you can outlying (Jeju, 83.3% and you may 6.8%, respectively) section when you look at the South Korea ( ). More over, we have said the fast secular alterations in brand new prevalence from myopia into the a realtor Korean human population (Kim ainsi que al. 2013a ). This type of change are likely of the severe data demands on the Korean people, given that Korean children are one of many higher painters about worldwide PISA surveys regarding college or university efficiency (Morgan & Rose 2013 ). Especially in the teenage years, Korean kids have also stated getting sleep deficiency, especially in new advancing years out-of high-school (Yang et al. 2005 ; Rhie ainsi que al. 2011 ). We ergo hypothesized one to sleep disorders ined that it hypothesis using member people-dependent study on the Korean NHANES education.