4.1.4 Advises on personal eye protection regulations and relevant standards, and appropriately advises patients on their occupational visual requirements.
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8 Terms
Protective eyewear is made to British standards to …
prevent and reduce risk of damage to the eye.
What is CR39?
Standard plastic - NOT A SAFETY MATERIAL
More suitable for “soft spectacles”
Classified as low impact by BS EN standards
What is polycarbonate?
n=1.586 (lightweight)
V=30 (poor peripheral performance)
Absorbs <380nm and has some UV protection
Impact causes grazes but no breakage of lens - soft material so good at resisting impact
What is trivex?
New plastic lens monomer
Strong, light and thin
High impact resistance
Polycarbonate vs Trivex
Trivex has a higher V number so a better peripheral performance
Trivex has an increased scratch resistance
Trivex is better at chemical resistance
Mechanical strength
(Marked on frames and/or lenses)
S Increased robustness
F High speed particles, low energy impact
B High speed particles, medium energy impact (goggles and face-shields only)
A High speed particles, high energy impact (face-shields only)
Frame properties
3 Resistant to liquid droplets, or liquid splashes
4 Resistant to coarse dust particles
5 Resistant to gas and fine dust particles
9 Resistant to molten metals and hot solids
G Resistant to radiant heat (face-shields only)
Ocular markings
K Resistant to surface damage by fine particles
N Resistant to fogging
G Resistant to radiant heat (face-shields only)
8 Resistant to short circuit electric arc (face-shields only)
9 Resistant to molten metals and hot solids (goggles and face-shields only)