Safety Eyewear Without Fogging
Don’t let smoke into your eyes or foreign objects.
Smoke can take considerable time to dissipate after fires.
Frame and lens materials have better heat resistance and antifogging properties than others. Fire grade positive seals of protective eyewear in cases of recent Tathra fires would have been ideal in reducing eye inflammation from smoke as would correct masks and respirators.
Should safety eyewear fog up under hot or steamy conditions, and if removed increased exposure to a possible variety of hazards could ensue.
Sixty per cent of all eye injuries happen in the workplace ,so every workplace, regardless of industry, should have eye safety procedures. Many people need education in this regard.
Radiation damage and the eye
- UVC 100 – 280nm. Blocked by the earth’s atmosphere. No ocular absorption.
- UVB 280 – 315nm. Absorbed into the cornea. UVB can directly damage skin cells’ DNA and are the main rays that cause sunburn. They are thought to cause most skin cancers .Basal cell carcinoma (BCC) is the most common cancer in the world. Eighty per cent of BCCs occur in the head and neck region, of which 20 per cent occur on the eyelids,
- UVA 315 – 380nm. Transmitted into the ocular media. The longer the wavelength, the deeper the penetration. These rays are linked to long-term skin damage such as wrinkles, but they are also thought to play a role in some skin cancers.
Gamma rays, X-rays, and high ultraviolet radiation can be a health hazard as it penetrates the body and will transmit through spectacle glasses though it will appear denser than soft tissues. This ionising radiation can cause cell damage ( from spectroscopy studies) as opposed to the nonionising radiation of visible light wavelengths and lower .
The longer wavelength and lower energy microwaves and radio waves will penetrate the body with some absorption. The eyes are one of the most sensitive organs in the body for microwaves. The microwaves excite the water molecules in the body and cause heat damage effects at high levels.
Special shielding similar to faraday cages is required to block this kind of radiation, glasses do not prevent transmission
All standards for electromagnetic radiation transmitting equipment, including those emitting microwave radiation, set safe limits, which are much below what will cause damage to the body.
Though the sun emits all of the different kinds of electromagnetic radiation, 99% of its rays are in the form of visible light, ultraviolet rays, and infrared rays (also known as heat).
Type of Hazard
High speed particle
Impact resistant lens (Polycarbonate); Lens coverage / size; side shields; Impact resistant frame or face shield; Lens stability and bevel profile.
Impact resistant lens; Lens coverage; impact resistant frame or protective google; Lens stability.
Sealed goggle, ventilation and fogging; Scratch resistant protection front and back lens surface.
Radiation (including UV) & Heat
Non-conducting frame; radiation protection and face shield; visible light control (welding); lens stability in frame; coating stability.
Chemical or biological spatter
Sealed goggle, ventilation and fogging; Ease of decontamination
Australian standards eye protection
Eye injuries in the workplace are most commonly caused by grinding and welding, usually in the fishing, construction, manufacturing, agriculture, forestry and mining industries .
Not wearing eye protection such as uvex overspecs,full vision googles or faceshields,or prescription safety glasses can lead to eye injury.
The best assurance is the use of the Standards Mark. Our suppliers are certified to use the Standards Mark.
Whilst Solar UVC is absorbed by the atmosphere, artificial sources of UVC may still be present.
Depending on the properties of the material different wavelengths of UV and visible radiation will either transmit through the lens or be blocked or reflected. This is the case for UVC, UVB and UVA. Not all contact lenses will block UV transmission, just as not all prescription lenses block UV.
Ocular absorption depends on the wavelengths and the age of the eye.
Sunglasses sold in Australia are not permitted to transmit UVB greater the 0.05% of total transmission, and, no more than 0.5% of total transmission of UVA, even less if the glasses are a category 4 sunglass. Because sunglasses are designed to protect against the sun and there is no UVC at ground level, UVC is not required to be tested. Occupational lenses need to be tested The Australian/New Zealand Standard AS/NZS 1338.1:2012 Filters for eye protectors – Filters for protection against radiation generated in welding and allied operations and AS/NZS 1338.2:2012 Filters for eye protectors – Filters for protection against ultraviolet radiation regulates eye protection in the workplace for occupations both indoors and outdoors where artificial UV radiation may reach potentially hazardous levels.
Safety glasses allow air around the eye area as opposed to a seal against the face, to avoid dust and splashes.
Face shields provide further protection and can also be worn over the safety eyewear
AS/NZS 1336: Recommended practices in occupational eye protection
Section 4 deals with the use of personal eye protectors in industrial settings and gives examples of specific hazards together with recommended eye protection.
Section 7 deals with prescription eye protectors.
AS/NZS 1337: Occupational eye and face protection
This Standard sets down the requirements for non-prescription eye protection.
There are four critical elements in compliant prescription eyewear.
1.) Appropriate frame
2.) Appropriate lens material and thickness
3.) Appropriate fitting
4.) Labelling and assuring compliance
Stop the fog on your glasses and protect your eyes
The interior water vapor condenses onto a single lens because the lens is colder than the vapor, although anti-fog agents can be used.
Antifogging eywear generally have two layers of airtight lenses (innner lens warmer outer lens colder) to prevent the interior from becoming “foggy” by keeping the temperature of the inner lens close to that of the interior water vapour
Ventilation safety glasses can prevent sweat from building up inside.
Fogging is the number one vision-related barrier to wearing safety eyewear.
SAI global certified anti-fog coatings are now available.
Handy belt cases can have them at the ready,so you not caught out.
Clip-ons Attached to a prescription spectacle or plano-lens frame,normally when glare is the only risk.
Overglasses Need to have correct fit/instability.
Wide vision Safety glasses – often resembling sunglasses. Additions such as frame collars provide peripheral protection.
Inserts – Eye protectors with a prescription carrier.
Wide vision goggles – Flexible frame or rigid with a separate cushioned fitting surface and headband.
Welding goggles – added protective measures for welding with air vents and anti-fog coatings.
Face shields can provide additional protection against extreme temperatures to the face, blasts and high impact
Smoke being a mixture of chemicals in gaseous, liquid and solid forms contains different-sized smoke particles .
Smoking tobacco is detrimental as is smoke in your eyes.
Generally eye irritation from smoke can be relieved by flushing with artificial tears and the use of a cold compresses depending upon the circumstances.
Prescription safety eyewear allows
• Increased comfort,improved vision
• Reduced weight.more fashionable
• Less reflection, Less restriction on movement and visual field
Respirators are classified by the type of hazard they protect against.
Negative-pressure respirators rely on the wearer to pull air in through cartridges or filter.
Disposable respirators, also known as filtering facepieces, are used to help protect against some particulate hazards. They’re lightweight and require no maintenance since they’re discarded after use.
Reusable respirators can be used with particulate filters, gas and vapor cartridges or combination cartridges, which may need to be replaced on a schedule or as needed.
Half-face respirators cover the lower half of the face, including the nose and mouth.
Full-face respirators cover the eyes and much of the face, and can sometimes replace the need for safety glasses.
Positive-pressure respirators do the work of pushing air to the respirator headtop or facepiece; they can either be powered-air, using a battery-powered blower to pull air through a filter, or supplied-air, bringing clean air through a hose from a source outside of the contaminated work area
Tight-fitting respirators must be fit-tested when use is required
Loose-fitting respirators typically have a hood or helmet.
Self-contained breathing apparatus (SCBA) is classified as a positive pressure supplied air respirator, but is different from all other respiratory equipment in that the user carries the source of the clean air with them in a tank.
Cartridges and/or Filters
Per AS/NZS 1715 there are 3 different classes of particulate filters, P1, P2 and P3.
The negative pressure particulate categories are based facepiece coverage. All particulate filtering facepieces that cover the nose and mouth area only can achieve only a P1 or P2 classification. A P3 classification can ONLY be achieved when worn with a full facepiece.
Class P1 particulate filters are used against mechanically generated particulates e.g. silica and wood dust.
Class P2 particulate filters are used for protection against mechanically and thermally generated particulates or both e.g. metal fumes.
Class P3 particulate filters are used for protection against highly toxic or highly irritant particulates e.g. beryllium (when worn with a full facepiece).
Certain contaminants may have specific respiratory selection criteria outside this guide e.g. asbestos.
Gas and vapour cartridges categories are distinguished by their filter type and class.
Filter type A = Certain organic vapours (boiling point above 65⁰C) from solvents such as those in paints and thinners (cartridge label colour = brown)
Filter type B = Acid gases such as chlorine, hydrogen sulfide (sulphide) and sulfur dioxide (cartridge label colour = grey)
Filter type E = Vapours from sulfur dioxide (cartridge colour = yellow)
Filter type ABE = are suitable for both certain organic vapours/acid gases and sulfur dioxide e.g. solvents, chlorine and sulfur dioxide (cartridge label colour = brown, grey and yellow)
Filter type K = ammonia gas (cartridge label colour = green)
Filter type ABEK = are suitable for both certain organic vapours/acid gases, sulfur dioxide and ammonia (cartridge label colour = brown, grey, yellow and green)
Other goggle types and uses
Blowtorch goggles are not the correct filters for arc welding which requires radiation proteection
Sports protection to prevent eye injury eg racketball sports
Astronomy and meteorology uses: dark adaption before going outside at night, in order to help the eyes adapt to the dark.