UV Flashcards
320-400 nm; longest wavelength, less energetic
UVA
290-320 nm; Medium wavelength, more energetic
UVB
<290 nm; shortest wavelength, most energetic
UVC
Primary Source of UV
Sun
Natural Sources of UV Rad
Sun, Lightning
Artificial Sources of UV
Tanning beds, welding torches, UV lamps, some types of lasers
2 Effect of UV rad on envi
ozone layer depletion
effect on phytoplankton
6 UV rad intensity factors
time of day, season of the year, latitude, altitude, cloud cover, reflection
UV levels higher between what time of day
10am-4pm
3 parts of the eye affected by UV radiation
cornea, lens, retina
2 Acute effects of UV to the eyes
photokeratitis, photoconjunctivitis
chronic effects of UV radiation
cataracts
chronic effect of UVB exp
macular degeneration
chronic effect of UVA & UVB exposure
pterygium
sunburn of the cornea and conjunctiva
photokeratitis
inflammation of conjunctiva
photoconjunctivitis
clouding of lens
cataracts
damage to retina; central vision loss
macular degeneration
growth on the sclera that can affect vision if it grows over the cornea
pterygium
measure the strength of UV
UV index
range of UV index
0-11+
indicates risk level for sunburn and eye damage
UV Index
you can safely stay outside
1-2 low
seek shade during midday hours
uv index
3-7, moderate to high
avoid being outside during midday hours
8-11, very high to extreme
spf
sun protection factor
measure of protection against UVB rays
spf
blocks ~97% UVB
spf
spf 30
blocks ~98% UVB rays
spf
spf 50
upf
ultraviolet protection factor
rating system for clothing
upf
blocks more than 98% of UV radiation in clothing
upf
upf 50+
look for ___ UVA and UVB protection in sunglasses
99-100%
protects both eyes and skin around eyes
sun glasses
provides nearly 100% protection against UVA and UVB rays
UV400 protection
blocks wavelengths up to 400 nm
UV400 protection
3 factors influencing choice of protection
UV protection
UV index level
duration of sun exposure
individual factors
