Study On The Value Of Wearable Devices In Monitoring Children’s Visual Behavior

Objective: To explore the value of smart glasses in monitoring visual behavior of myopic children,and to analyze the correlation between visual behavior and myopia progression of school-age children.Methods: Fifty myopic children aged 9 to 11 years in Yongchuan District,Chongqing,China were included in the study,and all participants’ daily time spent wearing glasses,time spent in outdoor activities,and near-work time from September 2019 to December 2019 were recorded using a questionnaire and Akeso smart glasses.Differences in visual behaviors recorded by the two modes were compared: data were collected for two time periods: from March 2 to 15,2020(online class mode during the COVID-19 epidemic)and from May 20 to June 2,2020(traditional school mode after the start of school and return to school).Equivalent spherical refraction and eye axis length were measured at baseline,6 months,and 1year later,respectively.Axial length and spherical equivalent refraction were obtained at baseline,six months intervals and one year later,respectively.Results: The distribution of the number of people in outdoor activities obtained from the questionnaire: ≤30 min(n=5),30 to 60 min(n=6),60 to120 min(n=23),>120 min(n=12),and the distribution of the number of people in each phase of the average daily outdoor activity time recorded objectively by Akeso was ≤30 min(n=16),30 to 60 min(n=26),60 to 120min(n=4),>120 min(n=0),the results were significantly different(p<0.001).The time of outdoor activities on weekday and weekend was[24(4,56)] min/d and [15(3,43)] min/d,respectively,with statistical significance(p< 0.001).The near-work time on weekday and weekend was(363.36±98.55)min/d and(329.08±105.90)min/d,respectively,with statistical significance(p<0.001).The objective measure of average daily wearing time of children under supervision was(711.80±101.63)min,while the time for children without supervision was(641.64±84.79)min(p=0.026).Outdoor time of the online class mode [9.5(0.75,48)] min was lower than the school mode [29(11.50,50)] min(p<0.001).The average near-work time was significantly different between the online class mode(396.58±114.41)min and the school mode(376.52±93.99)min(p=0.007,F=19.56).Compared to baseline examination(-2.33±0.81 D),the spherical equivalent refraction on oculus dexter corresponding to the examination after 6 months(-2.94±0.83 D,p=0.001)decreased,there is statistically significant increase in myopia in the online class mode.The outdoor time and axial length growth showed a negative correlation(R=-0.089,p<0.05).The correlation between the near-work time and spherical equivalent refraction growth showed positive correlation(R=0.14,p<0.01).Conclusion: Smart glasses can accurately record children’s visual behavior and can be used to supplement or replace questionnaires to participate in myopia prevention and control research;the acceleration of myopia progress of school-age children may be related to the increase of close working time and the decrease of outdoor activity time.