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Katherine Jayne Franklin, Nicola S Logan; Daily Light exposure in Myopic and Non-Myopic UK Children. Invest. Ophthalmol. Vis. Sci. 2018;59(9):3391.
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© ARVO (1962-2015); The Authors (2016-present)
To quantify effect of light exposure on refractive error in UK children.
Children aged 7-12 years from schools in the Midlands in the UK were recruited. Visual acuity, non-contact biometry using the IOLMaster and cycloplegic autorefraction were measured on both eyes. Questionnaire data from both children and their parents was used to evaluate environmental and lifestyle factors. Levels of time outdoors were compared through questionnaire data as well as two objective measures; wrist worn light sensors (Actiwatch 2) and measurement of conjunctival UV autofluorescence (CUVAF) using a custom made device. The wrist worn sensors were worn by 17 children over a simultaneous 11 day period, allowing one full week and two full weekends to be captured. Ambient light levels were recorded every 30 seconds throughout the period equating to 2,880 measurements every day.
Recruitment and data collection are ongoing. To date for 17 participants the mean age was 9.2 years (range 7.71 – 10.5); 58.8% female. The mean refraction was +1.41D (range -2.31 – +4.72) and 17.6% were myopic. Mean daily light exposure for all 17 children was 1171 ± 2190 lux. No difference was found between weekdays and weekends, 1301 ± 2251 lux and 957 ± 2065 lux respectively (p=0.068). The average amount of daily time spent in bright light conditions (>1000 lux) was found to be 132 ± 55 minutes. A good correlation was found between the objective measure of time spent outdoors using the wrist worn sensor and the children’s questionnaire data (p=0.099). However, a significant difference was found between the objective data and parental questionnaire data (p=0.003). No detectable CUVAF has been observed in any participants to date.
Children in the UK spent on average 132 minutes in bright conditions (>1000 lux) per day which can be used as a measure of the amount of time spent outdoors. When comparing this data to the subjective measures of time outdoors the data from the children’s questionnaire was found to be a more reliable measure of time spent outdoors when compared to parental questionnaire data. Further recruitment and data collection are needed in order to further assess the relationship between daily light exposure, refractive error and ocular biometry.Funding: Aston University LHS PhD studentship
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.
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