by Oldbloke » 18 Nov 2014, 5:20 pm
I often see “shooting glasses” for sale on various forums, magazines and online. Sometimes they use the terms “ballistic” or “velocity” giving the impression that they provide a very high level of impact protection in the event of a mishap or firearm failure. It is unfortunate that the old term “buyer beware“ still applies. Why, well when you ask about what level of protection they offer sometimes you receive vague answers or a test result that is difficult to understand and difficult to compare with the generally accepted methods. (see these tests below) Prices vary greatly but are usually over $100 and recently I saw some for sale at about $250 a pair. When I asked about impact protection I received information suggesting that they may well fail all of the tests below. They were also advertised with the advantage that the lenses easily pop out to change lens colour. If this is the case then will the lens “pop” out when impacted? I suggest they may, leaving you with little if any protection when you most need it. Sun Glasses legally need only pass one of the “low” impact tests below and you can see the level of protection is much lower that standard safety glasses with a medium impact rating. So you would be smart to avoid them. But who is checking? Probably nobody, there is no government agency that I am aware of checking. We rely on the seller, in the work place that is a little different.
AU & US TEST METHOD: A pair of glasses are placed on a foam mannequin head form and a steel ball weighing 1.06 grams is fired at the lens. The USA & Australian Standards test are almost identical but the speed of the balls varies. It is a failure in Australia or the USA if;
• if it cracks through its entire thickness into two or more pieces;
• if more than 5 mg of the ocular material becomes detached from a part of the lens
• surface remote from the surface struck by the ball;
• if the ball passes through the lens; or
• if contact is made with either eye of the test head form by the ball, frame, lens or
any part or fragment of these.
Australia
AS 1337.1 Sun Glasses Low 22 mm steel drop ball 1.8 meters high (speed not known)
AS 1337.1 Sun Glasses Low 6.35 mm steel ball 12 m/s
AS 1337.1 Safety Glasses +Med 6.35 mm steel ball 40 m/s
AS 1337.1 Face shield High 6.35 mm steel ball 110 m/s
AS 1337.1 Face shield Extra High 6.35 mm steel ball 175 m/s
USA
Z87.1 Sun Glasses Low 25.4 mm steel drop ball 1.27 meters high (speed not known)
Z87.1 Safety Glasses High 6.35 mm steel ball 45.72 m/s
Z87.1 Goggles Very High 6.35 mm steel ball 76.20 m/s
Z87.1 Face shields Extra High 6.35 mm steel ball 91.44 m/s
Now as we know we are often asked to wear safety glasses at work and the (+)medium impact test is a minimum requirement for all safety glasses in Australia. So why would we purchase “Shooting Glasses” that do not pass that or the US high impact test? Sun Glasses may look cool and even perhaps provide some optical advantage but if they fail when most needed, what then?
If purchasing a pair of new shooting glasses I strongly suggest you ask the question, "do they pass the Australian standard test for medium impact test or the USA high impact test?"
After all, a good quality pair of safety glasses (often polarized and in various tints) from the local OHS shop can be had for about $20.
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