Sunscreen Flashcards
Solar ultraviolet irradiation can be harmful to the skin. It is responsible for skin disorders such as ________________, ______________, and it provokes the various cutaneous _______________
polymorphic light eruption
solar urticaria
porphyrias
Solar UV irradiation may trigger or aggravate skin lesions of ________________, ______________, and other dermatoses, as well as attacks of recurrent ______________
lupus erythematosus
rosacea
Herpes labialis
Certain drugs, such as ________________, _______________, or ________________, can cause photosensitivity.
demeclocycline
phenothiazines
amiodarone
The UV effects of exposure over longer periods include _____________, and more importantly the initiation of _____________.
ageing changes
skin cancer
Solar ultraviolet radiation is approximately ______________ in wavelength.
200–400 nm
Which wavelength of solar radiation cause sunburn?
UVB, medium wavelength sunlight (290-320 nm)
The long wavelengths (320–400 nm, known as UVA) are responsible for many ________________ and _______________.
photosensitivity reactions
photodermatoses
Which UV wavelengths contribute to long-term photodamage, skin cancer, and aging?
Both UVA and UVB
Are sunscreen preparations an adequate substitute for covering the skin and avoiding sunlight?
No; although they protect against UVA and UVB, they are not a substitute
What does SPF stand for?
Sun protection factor; provides guidance on the degree of protection offered against UVB
The sun protection factor (SPF, usually indicated in the preparation title) provides guidance on the degree of protection offered against ________
UVB
What does SPF (the sun protection factor) indicate?
The multiples of protection provided against burning, compared with unprotected skin; for example, an SPF of 8 should enable a person to remain 8 times longer in the sun without burning
Most users do not apply sufficient sunscreen product. The amount of sunscreen needed to cover the body of an average adult to achieve the stated SPF is around _________ mL or _________ teaspoons of lotion
35
6–8
The EU Commission (September 2006) has recommended that the UVA protection factor for a sunscreen should be at least ________ of the sun protection factor (SPF); products that achieve this requirement will be labelled with a UVA logo alongside the SPF classification
one-third
Preparations that also contain ___________ substances, such as titanium dioxide, provide the most effective protection against UVA
reflective