4.1.4 Saftey Spex

Question 1

Questions to ask at dispense

Answer 1

• what environment they work in
• what’s their occupation
• have they worn safety specs before
• any high velocity particles
• work with chemicals

Question 2

Types of eye protectors

Answer 2

• safety spectacles with side shields
• afocal, one piece wrap around
• cup type goggles
• box type goggles
• face shields
• helmets

Question 3

Safety spec specifics

Answer 3

• not suitable for dust, gases, molten metal, hot solids, liquid droplets, or splashes
• can adjust LTB to ft well
• can be glazed with rx
• available in plastic frames

Question 4

What are afocal safety specs

Answer 4

• singe piece of polycarbonate, one size and best for emmetropes

Question 5

Cup type goggles

Answer 5

• housing from PVC
• good for flying particles
• poor ventilation and field of view

Question 6

advantages and disadvantages to plastic lenses

Answer 6

Advantages
- impact resistance
- large fragments
- lighter
- thinner
- withstands molten metal better
- less condensation
- greater UV protection than glass

Disadvantages
- soft
- easy to scratch
- hard coat reduces impact resistance

Question 7

Polycarbonate properties

Answer 7

• very soft
• good for kids specs
• cracks on impact
• no warping
• lightweight
• absorbs UV
• can be damaged by chemicals like acetone

Question 8

What markings can be on safety specs

Answer 8

• BSEN166
• UKCA marking
• Manufacturers mark
• Kite mark
• Optical Class
• Mechanical Freedom
• Scale Number

Question 9

What is BN EN 166

Answer 9

All protective eyewear in the uk must conform to the European standard, which has several differing levels of impact resistance

Question 10

What is the UKCA marking

Answer 10

Products must meet legal requirements before they can be sold within the uk

Question 11

What is the kite mark

Answer 11

Considered the world’s premier symbol of trust, integrity and quality. It indicates that manufacturers carrying the mark have satisfied the most rigorous quality process

Question 12

What is the optical class

Answer 12

• this refers to the clarity of the lens, indicating how long and how often the glasses can be safely worn

Class 1
- best quality
- can be worn continuously

Class 2
- lesser optical quality
- suitable for intermittent use

Class 3
- lowest quality
- suitable for occasional use

Question 13

Mechanical strength markings

Answer 13

S - increased robustness
F - low energy impact
B - medium energy impact
A - high energy impact