Table 5.
Seasonal effects on climate and on perimetric sensitivity within each geographic zone.
| Seasonal Variation in: | |||
|---|---|---|---|
| Zone | Temperature (°C) | Sunlight (Hours per day) A | ΔMD (dB) B |
| North | 30 | 7 | 0.22 |
| Central | 27 | 7 | 0.10 |
| West | 12 | 6 | 0.07 |
| Pacific Northwest | 19 | 8 | 0.06 |
| Atlantic | 26 | 5 | 0.03 |
| Southeast | 15 | 5 | 0.02 |
A
Taken as the maximum monthly mean minus the minimum monthly mean, averaged over all test sites within that zone.
B
The magnitude of the seasonal effect on the change in perimetric Mean Deviation since the previous visit (ΔMD), taken from Table 2. Zones are ordered according to the seasonal effect on ΔMD.