| Eyeglasses Uptake | Eyeglasses Usage | ||||||
---|---|---|---|---|---|---|---|---|
 | Short term | Long term | Short term | Long term | ||||
 | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
 | Unadjusted | Adjusted | Unadjusted | Adjusted | Unadjusted | Adjusted | Unadjusted | Adjusted |
1. Voucher | 0.606*** | 0.615*** | 0.447*** | 0.454*** | 0.446*** | 0.451*** | 0.246*** | 0.265*** |
(0.022) | (0.020) | (0.024) | (0.024) | (0.025) | (0.023) | (0.027) | (0.025) | |
Control variables | ||||||||
2. Age (Years) |  | 0.011 |  | 0.020** |  | 0.021** |  | −0.000 |
 | (0.009) |  | (0.010) |  | (0.010) |  | (0.013) | |
3. Female (1 = yes) |  | 0.009 |  | −0.002 |  | −0.005 |  | 0.001 |
 | (0.016) |  | (0.019) |  | (0.018) |  | (0.021) | |
4. Boarding at school (1 = yes) |  | 0.017 |  | 0.005 |  | 0.051* |  | 0.007 |
 | (0.027) |  | (0.034) |  | (0.029) |  | (0.032) | |
5. Grade four (1 = yes) |  | −0.009 |  | 0.004 |  | −0.009 |  | −0.041* |
 | (0.017) |  | (0.021) |  | (0.023) |  | (0.024) | |
6. Student has eyeglasses at baseline (1 = yes) |  | 0.468*** |  | 0.302*** |  | 0.494*** |  | 0.363*** |
 | (0.047) |  | (0.033) |  | (0.046) |  | (0.033) | |
7. Left-behind child (1 = yes) |  | −0.001 |  | −0.035 |  | −0.003 |  | −0.047 |
 | (0.022) |  | (0.030) |  | (0.031) |  | (0.032) | |
8. Visual acuity of worse eye (LogMAR) | Â | 0.085** | Â | 0.181*** | Â | 0.086* | Â | 0.302*** |
 | (0.042) |  | (0.049) |  | (0.049) |  | (0.053) | |
9. Father has completed high school (1 = yes) |  | 0.003 |  | −0.005 |  | 0.025 |  | 0.022 |
 | (0.022) |  | (0.026) |  | (0.023) |  | (0.030) | |
10. Mother has completed high school (1 = yes) |  | 0.014 |  | 0.005 |  | −0.000 |  | 0.020 |
 | (0.026) |  | (0.030) |  | (0.031) |  | (0.030) | |
11. At least one family member wears glasses (1 = yes) |  | 0.020 |  | 0.032 |  | 0.023 |  | 0.047** |
 | (0.018) |  | (0.021) |  | (0.020) |  | (0.021) | |
12. Household asset index | Â | 0.004 | Â | 0.013 | Â | 0.003 | Â | 0.009 |
 | (0.007) |  | (0.008) |  | (0.006) |  | (0.008) | |
13. Distance from school to the county seat (km) |  | −0.002*** |  | −0.001 |  | −0.002** |  | 0.001** |
 | (0.001) |  | (0.001) |  | (0.001) |  | (0.001) | |
14. Constant | 0.262*** | 0.039 | 0.456*** | 0.075 | 0.227*** | −0.131 | 0.379*** | 0.042 |
(0.015) | (0.102) | (0.019) | (0.126) | (0.016) | (0.120) | (0.019) | (0.155) | |
15. Observations | 1989 | 1980 | 1950 | 1941 | 1989 | 1980 | 1950 | 1941 |
16. R-squared | 0.411 | 0.533 | 0.262 | 0.332 | 0.258 | 0.395 | 0.122 | 0.231 |
17. Mean in prescription group | 0.248 | Â | 0.427 | Â | 0.210 | Â | 0.345 | Â |