8 - Illumination Flashcards
1
Q
Illumination and distance
A
Inverse: moving light 2x as close = 4x as bright
2
Q
Glare
- discomfort
- veiling
A
D: bright sunlight, reflections off surfaces
V: affects contrast, often not subjectively noticed
3
Q
Illumination
-varies with age: rule
A
20-40-60 rule:
40 year old needs twice as much as 20 yo
60 year old needs thrice as much as 20 yo
4
Q
Lighting
- avoid what end of spectrum
- good option
- tend to work very well
A
Blue - scatters
LEDs - depends on color temp
“Daylight bulbs”
5
Q
Sunglasses vs filters
A
S: overall depression of transmission curve
F: selective elimination of specific wavelengths
6
Q
T/F: tints only match color, not wavelength transmission
A
True: many labs don’t use spectrometry = produce tints, not filters
