Table 3

Results from previously published studies and comparison with current study with respect to light exposure parameters—average illuminance exposure, time spent outdoors and epoch at outdoors

StudyParticipant (n)
(Age in years)
Duration and sampling frequency per dataDevice used
(Duration when data was analysed)
Result
Average illuminance exposure (Lux)Time outdoors (≥1000 lux) (min/day)Epoch outdoors (≥1000 lux) (no. of peaks/day)
Dharani et al,
Singapore33
M: 65, NM: 52
(6–12)
1 week
(5 min)
HOBO pendant temp/light
(7:00–19:00)
School day
M: 62±46
NM: 65±64
Non-school day
M: 83±58
NM: 89±68
Read et al, Australia24M: 41, Emm: 61
(10–15)
2 weeks
(30 s)
Actiwatch-2
(6:00–18:00)
M: 915±519
Emm: 1272±625
M: 91±44
Emm: 127±51
Ostrin,
USA26
M: 37, Emm: 18 (21–65)2 weeks
(30 s)
Actiwatch Spectrum
(24 hours)
M: 1612±1055
Emm: 1759±1385
M: 106±51
Emm: 125±66
Landis et al, Australia36M: 40, NM: 40 (10–15)2 weeks
(30 s)
Actiwatch 2
(NR)
School day
M: 81±5.4
NM: 111±6
Non-school day
M: 76±9
NM: 116±12.6
Wen et al, China25M: 28, NM: 58
(10.13±0.48)
1 week
(2 min)
Clouclip
(7:00–20:00)
M: 739±429
NM: 832±440
M: 100±42
NM: 119±56
M: 7.22±1.53
NM: 8.31±1.71
Li et al, Singapore37M: 204, NM: 279
(9)
1 week
(1 min)
FitSight
(7:00–19:00)
458±228*100±93*1.7±1.0*
Current study
2023, India
M: 50, NM: 93
(9–15)
6 days
(1 min)
MyLyt
(7:30–18:00)
M: 789±511
NM: 908±466
M: 44±25
NM: 51±21
M: 9±5
NM: 10±6
Median valuesM: 649 (500–893)
NM: 863 (557,1099)
M: 37 (24–58)
NM: 46 (33–64)
M: 8 (5–13)
NM: 9 (7–12)
  • *Represents the average data of all the participants (myopic and non-myopic participants). The last row represents the median values of the current study.

  • Emm, emmetropes; M, myopes; NM, non-myopes; NR, not reported.