Table 1.
Ambient Luminances, Corresponding Illuminance Levels at the Participant's Eye Position at a Testing Distance of 1 m and Suitable Examples of Daily Life From Literature2 and Own Measurements
| Ambient Luminance in VA-CAL | Corresponding Illuminance at 1 m | Examples2 of Daily Life With Corresponding Luminance | Own Measurements With Luminance Meter |
|---|---|---|---|
| 30 cd/m² | 20 lux | White paper under lamp Text on computer screen | Caucasian facial skin (over cheek bone in interior lighting, office) |
| 320 cd/m² | 260 lux | Wall, ceiling (with interior lighting, office) Computer display | White paper under interior lighting (office) Max. BCVA background (DIN EN ISO 8596) |
| 1000 cd/m² | 770 lux | Daytime road surface | White car (in shadow, sunny day) |
| 3000 cd/m² | 2300 lux | Traffic lights Full moon | Doctors’ white coat (in shadow, sunny day) |
| 5000 cd/m² | 3700 lux | Overcast sky (daytime) | Surface of cobblestones (in sunlight) |
| 8000 cd/m² | 6200 lux | Blue sky (daytime) | Caucasian facial skin (over cheek bone in sunlight) |
| 10,000 cd/m² | 7800 lux | Wet (reflective) road | White FFP2 face mask (in sunlight) White porcelain plate on table (in sunlight) |