Table 3.

Clouclip M2 and the average value of eye behavior and eye environment data measured in questionnaire survey.

	Clouclip M2	Questionnaire survey	t	P
Average total time for near work per day (min)	294.80 ± 109.114	250.10 ± 103.10	3.243	0.001
Maximum time for single near work (min)	81.56 ± 37.54	40.88 ± 28.37	6.087	<0.001
Average distance of near work (cm)	32.21 ± 4.44	24.94 ± 8.04	12.394	<0.001
Average total time for outdoor activities per day (min)	61.50 ± 27.97	73.24 ± 35.75	−4.174	<0.001
Average outdoor exposure times per day (times)	7.91 ± 4.78	–	–	–
Daytime luminance (lux)	181.96 ± 63.41	–	–	–
Nighttime luminance (lux)	88.25 ± 55.97	–	–	–

P value indicates whether there is statistical significance in the difference between cloud clip M2 and the relevant contents of the questionnaire.