Answer by labsupport on question Should shared safety glasses be decontaminated after each use?
updated 21 December 2022
Eye Protection for science experiments
The importance of eye protection during school science experiments should be effectively communicated and the wearing of appropriate eye protectors enforced. A site-specific risk assessment should be performed to determine the most appropriate type of eye protection for the activity. In most school science situations, wrap-around safety glasses give suitable eye protection unless a school-based risk assessment recommends the use of safety goggles.
The type of eye protection selected should be suitable to the nature of the work for which it is intended and any associated hazards in accordance with AS/NZS 1336-2014 Eye and face protection guidelines.1 This eye protection should comply with the requirements of AS/NZS 1337 Personal eye protection.2 Eye protection that meets this standard should have the manufacturers ID and ‘AS1337’ imprinted on the side.3 Additional markings may include “I” or “F” indicating protection from medium impact or “C” or “3” indicating protection from chemical splash. Safety glasses and safety goggles have different applications.
Safety glasses are an eye protector with protective lenses, most often polycarbonate lenses, mounted in spectacle-type frames, or moulded in one piece with side shields and air vents, and can look like normal spectacles.
Safety glasses are intended to provide eye protection against common laboratory hazards such as chemical and biological splashes and low-impact energy activities. The lenses must be appropriate to the protection required.
Note: while it is possible to obtain prescription safety glasses, normal prescription glasses are not considered safety glasses as they do not provide protection against impact and usually do not provide sufficient coverage against flying debris and splashes.
Safety goggles should be used when greater protection is needed than provided by safety glasses e.g., where medium or high-impact energy activities are occurring or strong chemicals are in use. The lenses must be appropriate to the protection required. Goggles usually have head straps.
Safety goggles fit tightly against the face and are available in two designations:
- Eyecup goggles—an eye protector consisting of two lenses mounted in cups supported by a flexible nose bridge and headband.
- Wide-vision goggles—an eye protector in which the lens or lenses extend over the full width of the face, affording a large field of vision. Includes cover-all goggles designed to fit over prescription spectacles.
Considerations for choice of eye protection:
Choose for purpose:
- A site-specific risk assessment4 should be completed to identify hazardous chemicals and physical impacts where safety glasses or goggles are required.
- In science education, safety glasses that are certified low–medium impact and carry the manufacturer’s ID and ‘AS1337’ imprinted on the side are suitable for most activities.
- Some safety glasses styles allow them to be worn over prescription glasses, which provides the necessary protection to the wearer of prescription glasses.
- Consideration could be given to individuals purchasing prescription safety glasses. Changes to the Australian Standard now mean that prescription safety glasses must now be compliant with the new medium-impact requirements.
- There may be times, particularly in the preparation room, where goggles or a face shield are more appropriate.
Choose for fit and comfort:
- Eye protection should be suitable in size and fit and reasonably comfortable for the student or employee who is to wear it.
- Larger sizes are available for adults and senior students.
- Smaller sizes can be purchased for younger students.
- Appropriate choice of “over” safety glasses is necessary when worn over prescription glasses.
- Safety glasses are generally more comfortable and practical for student use than safety goggles.
- Goggles are prone to poor air circulation and fog up, which may create a secondary hazard. They are also more difficult to keep clean.
Cleaning, maintaining and sanitising safety glasses and goggles
It is important that safety glasses are in good condition, clean and free from dust to facilitate good vision. When safety glasses are shared, the potential for the transmission of infectious diseases is low, however it is important to consider risk control strategies to address this.
There are no regulations that specifically stipulate a procedure for cleaning safety glasses or goggles in a school environment. Australian Standards do not specify sanitising or disinfecting and are not prescriptive regarding the type of cleaning required due to the numerous different workplace settings. AS/NZS 1336:2014 Eye and face protection—guidelines1contain information regarding the issue, maintenance and reissue of personal eye protection. Institutions that supply and use a large number of safety glasses should ensure that their systems cater for the following requirements for safety glasses.
- Selection: Suitable types and fits are available for all users and situations.
- Storage: Storage is designed to minimise scratching and keep the glasses clean.
- Inspection: Regular inspections are made so that any damaged or faulty glasses are withdrawn from use.
- Cleaning: Regular cleaning should be conducted, before and after use by another person.
Cleaning a class set of safety glasses or goggles in between classes in a school setting is difficult to achieve, due to time constraints. Schools can either require the students to provide their own safety glasses, or they should establish systems for the suitable selection, storage and regular inspection and cleaning of safety glasses.
In the majority of cases, where schools provide class sets of safety glasses, Science ASSIST has the following recommendations.
- Regular inspections and cleaning of the class set of safety glasses should be conducted once or twice a term by the laboratory staff.
- Scratched or otherwise damaged safety glasses should be removed from use.
- Safety glasses should be washed with warm soapy water followed by a water rinse and then allowed to dry.
- Provision should be made for students to either bring their own safety glasses, or for students to clean a pair from the class set using one of the following methods.
- Washing with warm soapy water followed by a water rinse and then allowed to dry.
- Cleaning with disinfectant or alcohol wipe (under supervision).
In the school setting
Schools have a duty of care to ensure that students wear safety glasses when handling hazardous substances. There needs to be an effective system for the storage of safety glasses, as well as their cleaning and maintenance. Most information currently available recommends the cleaning of shared safety glasses in between use. (5,6) The table below lists our recommended cleaning options, along with some advantages and disadvantages.
|Each student provides their own pair of safety glasses||
The school provides safety glasses to be shared.
Regular inspections once or twice per term and regular cleaning, are conducted by the laboratory technician.
Washing with warm soapy water followed by a water rinse and then allowed to dry.
|Students are responsible for individual cleaning of their glasses.||
|Provide alcohol wipes containing 70% isopropyl alcohol.||
Selection of safety glasses: The wearing of prescription glasses cannot, under any circumstances, be considered as a substitute for normal eye protection.7 Over-glasses, goggles or face shields should be worn over prescription glasses as appropriate.
Storage of safety glasses: Safety glasses should be properly stored in a suitable rack in a dry place to avoid accumulating dust as well as to avoid the scratching of lenses.
Maintenance of safety glasses: The major issue with safety glasses is that they can become severely scratched and reduce visibility, which causes an additional hazard. Paper towel and some tissues should not be used as they may contain abrasive materials, which will scratch the lens. Other problems with safety glasses are the snapping of the frame in the centre due to students over-flexing the lenses when putting the goggles on or off.
Contact lenses: Wearers of contact lenses may face additional hazards where items enter the eye. For this reason, special consideration should be given to the type of eye protection or whether contact lenses should be worn for particular activities.7
Transmission of infectious diseases: The risk of environmentally associated laboratory infections is rare. All of the following conditions, referred to as the “chain of infection”, are required for an infection to be transmitted.
- The presence of a virulent pathogen in a concentration high enough to cause disease.
- The ability of the pathogen to be transmitted to the host from the environment.
- The susceptibility of the host to contract a disease from the pathogen.
- The pathogen is able to survive conditions of the environment to remain active.
Washing with warm soapy water followed by a water rinse and then allowed to dry is considered sufficient to decontaminate shared safety glasses.
A conversation with Health Direct8 confirmed that there is no established protocol for cleaning shared safety glasses, so they suggested good general cleaning practices and the need for good handwashing and hygiene. It should be noted that PPE means personal protective equipment and should not really be shared.
- Recommend washing safety glasses in a soap/detergent solution, followed by rinsing and air drying. Concerns were raised about 30+ students putting their hands into one tub of soapy water as this would increase the load of contaminants to the water.
- Discouraged the use of other products such as Dettol, Glen20: which may contribute to an allergic reaction in some people, especially given that safety glasses are worn near the eyes. We don’t want to create a new problem while we are trying to solve another problem.
- Suggested other options which include
- Using alcohol wipes (however this could be expensive and difficult to source)
- Using 70% alcohol sprays (however there are significant risks associated with the school science setting such as potential open flames, unpredictable and poor student behaviour - The teacher would have to make sure that there are no open flames, hot surfaces, that students are well supervised and it is appropriately stored)
Science ASSIST recommends that schools familiarise themselves with the most up to date information about the Coronavirus. Active promotion of good hygiene practices and posters containing information about how the virus spreads, with the correct methods of hand washing and drying, are recommended to protect against infections.9
As the situation is continuously changing, see the latest updates from the Australian Government Department of Health regarding Coronavirus (COVID-19)10,11,12
1 Standards Australia website (2022), ‘AS/NZS 1336-2014 – Eye and face protection guidelines’, retrieved from https://store.standards.org.au/product/as-nzs-1336-2014 available for purchase
2. Standards Australia website (2022), ‘AS/NZS 1337 – Personal eye protection’, retrieved from https://www.standards.org.au/standards-catalogue/sa-snz/publicsafety/sf-006/as-slash-nzs–1337-dot-1-2010 available for purchase
3. UVEX website, (2022), ‘Australian standards for safety glasses’, retrieved from https://www.uvex-safety.com.au/en/knowledge/safety-standards/safety-glasses/
4. Science ASSIST website, (2014, July), ‘Risk assessment template’, retrieved from https://assist.asta.edu.au/resource/2298/risk-assessment-template
5. Mfasco health and safety website, (accessed 2022, December), ‘How to disinfect safety glasses’, retrieved from https://www.mfasco.com/blog/how-to-articles/how-to-disinfect-safety-glasses.html
6. Queensland Government Worksafe website, (2019, September 20), ‘Personal protective equipment – PPE’, retrieved from https://www.worksafe.qld.gov.au/safety-and-prevention/creating-safe-work/managing-risks/personal-protective-equipment-ppe
7. University of Queensland website, (2021, May 15), ‘Eye protection guidelines’, retrieved from https://ppl.app.uq.edu.au/content/2.30.04-eye-protection
8.Health Direct Personal Communication, (2020, March 12), retrieved from https://www.healthdirect.gov.au/
9. Safe Work Australia website, (2020, April), ‘Signage and posters – Covid 19’ retrieved from https://covid19.swa.gov.au/doc/signage-and-posters-covid-19
10. Australian Government Department of Health and Aged Care, (2022, December 15), ‘Coronavirus information about environmental and disinfection in the community’ retrieved from https://www.health.gov.au/resources/publications/coronavirus-covid-19-information-about-routine-environmental-cleaning-and-disinfection-in-the-community
11. Australian Government Department of Health and Aged Care,(2022, November 25), ‘Communicable diseases – Coronavirus pandemic’, retrieved from https://www.health.gov.au/topics/communicable-diseases
12. NSW Government, NSW Health, (2022, October), ‘Covid 19 posters and print resources’, retrieved from https://www.health.nsw.gov.au/Infectious/covid-19/Pages/posters-and-print.aspx
American Chemical Society website, (2020, December 7), ‘Recommendation for sharing, cleaning and disinfecting safety goggles and glasses’ retrieved from https://www.acs.org/content/dam/acsorg/about/governance/committees/chemicalsafety/publications/acs-goggle-safety-2020.pdf
National Science Teachers Association NSTA (USA), (accessed 2022), ‘Eye protection and safer practices FAQ’, retrieved from, https://www.nsta.org/eye-protection-and-safer-practices-faq
Safe Work NSW website, (accessed 2022), ‘Personal Protective Equipment - PPE’, retrieved from https://www.safework.nsw.gov.au/safety-starts-here/physical-safety-at-work-the-basics/personal-protective-equipment-ppe