What is meant by safety goggles?
Safety goggles is safety eyewear composed of several types of special glasses are used for eye protection and area around the eyes. The discussion here only about the safety glasses in the context of its use to prevent mechanical injury alone, and not engaged in hazardous radiation protection. However, for the purpose of ray radiation protection, specific filter lenses are used.
Routine activities such as work, sports and hobbies do makes us vulnerable to dangerous environments that can injure eyes. Mechanical injury to the eyes and around can happen in the following circumstances:
Certain sports:
- Squash
- Cricket.
- American football
- Tennis
- Flying particles
- Hazardous liquid splash
- Dust
- Smoke
The type of lens used in the manufacturing of safety goggles
Unlike regular sunglasses , safety goggles consist of certain types of lenses depending on the scope of work and activity. The type of lens in the manufacture of safety goggles is as follows :
Material CR39
- Generally known as the lens ' plastic ' .
- Originally used to fill the fuel tank of B17 bombers leak in World War II .
- Widely used in the manufacture of ordinary glasses .
- Better quality and is a top choice in compounding ophthalmic in optometrist.
- Type CR39 lens material more easily cut with a mower lenses found in most optometrist.
- The material is not too hard and breaks down when exposed to high mechanical impact .
- When broken , the pieces are quite sharp and can cause injury to the eye .
- Only used when engaged in activities that are not exposed to high mechanical impact such as avoidance of harmful liquid splashes , dust and smoke .
Polycarbonate material
- Widely used in the manufacture of drinks, sunscreen in public, and the protection of bank employees at the counter of explosive bullets by firing a gun.
- Type material is harder and requires a special cutting machine for cutting the lens.
- Optical quality comparable to that of CR39 but polycarbonate is lighter.
- Polycarbonate is resistant to mechanical impact as strong as iron particles flying from welding activities and the impact of squash balls.
- Too strong impact on polycarbonate lenses usually involves a large crack across the board but rarely produce sharp fragments like the CR39 lenses.
- Suitable for use as lenses in safety glasses when engaged in sports activities and work with industries that are exposed to strong mechanical impact.
Selection of the proper safety goggles
In general, the selection of appropriate safety goggles depending on the selection of lens types involved and the size of the lens.
If the work activity only involves exposure to dust, fumes and chemical splash, goggles with CR39 lenses can be used. If work activities, gardening or sports involving exposure to strong mechanical impact like particles flying from the rock or the impact of a tennis ball, goggles with polycarbonate lenses more appropriate. The size of the safety eyewear that cover around the eyes or the entire face selected depending on the activities involved such as work, gardening or sports.
The size of the right glasses is important because it can provide a comfortable movement and improve safety while doing the activity.
image: solutions.3m.com
