JAAD Possible Questions Flashcards
What is the spectrum for visible light
400-700
UVR range
10-400 nm
Red and blue light spectrums and which penetrate the skin deeper
Red 625-700
Blue 400-500
Red penetrates the full thickness of skin
What % of VL is reflected by skin surface
4-7
Which has higher energy - blue or red light
Blue light
How far does RL and BL penetrate
RL is 6-50 nm
BL 0.5 - 1 mm
Epidermal thickness
30-100 um
Epidermal and derma thickness
0.5-6 mm
VL is implicated in what photodermatoses commonly
Solar urticaria
Cutaneous porphyria (makes sense Soret band)
Less commonly PMLE and CAD
PMLE - what light is commonly implicated
UVA alone most commonly
But UVB and uncommonly VL can xause
CAD - which light is associated with severe exacerbation
UVB the worst
Mostly UVB UVA and rarely VL
What are the UV ranges
UVB 290-320 UVA2 320-340 UVA1 340-400 VL 400-700 IR 700- mm
5 main types of organic filters (chemical filters)
PABA Benzophenones Salicylates Cinnamates Other
What part of sunscreen protects against visible light
Tinted sunscreens: blends of iron oxides and titanium oxygen pigment
Because the chemical and physical blockers dont cover visible light
What does broad spectrum sunscreen mean
> 370 nm
At least 90% of the products total absórbance must be at or above this wavelength when measured using UV wavelengths ranging from 290-400 nm
