Here are our frequently asked questions. Please feel free to contact us if you don't find your answer here.
How do I know if Magna Lens eyewear will fit my face properly?
Our safety eyewear has adjustable side components so that they can fit most any size face or head. Since they magnetically attach to the earmuffs, the tendency to slide down your nose is eliminated. You will be able to wear your eye ear protection for long periods of time without the need to keep adjusting or pushing up your eyewear.
What if I wear prescription lenses?
Magna Lens offers an optional snap-in prescription frame (Rx to be added by an optometrist) which can be installed on the inside of your Magna Lens one-piece wrap-around lens.
What is the noise reduction rating on Magna Lens earmuffs?
Our earmuffs are configurable. Out of the box they have a 30db NRR (noise reduction rating). They can also be converted into a low profile configuration which has a 28db NRR.
Can I add Magna Lens eyewear to my existing earmuffs?
Magna Lens offers an adapter kit so that you can add magnetic attachment points to your existing earmuffs. This adapter kit is compatible with most models of earmuffs, please contact us to verify compatibility.
Do Magna Lens earmuffs offer better hearing protection than other brands?
Yes and No. While many earmuff models offer similar noise reduction ratings (without eyewear), the Magna Lens design eliminates the gap in the earmuff cushion caused by eyewear. This gap can reduce your earmuff noise reduction rating anywhere from 2 to 10db depending on eyewear design. This means that your 30NRR earmuffs may only provide 20NRR with traditional eyewear.
How do I know how much noise my gun generates?
Here are some approximate noise ratings for various
firearms (indoor range tests):
.22LR pistol 154-158db
.45 auto pistol 158-163db
.40 S&W pistol 158-161db
9mm pistol 160-163db
.357 handgun 167-172db
12ga shotgun 158-160db
.556 rifle 165-167db
How much noise can I endure before I encounter hearing damage?
The National Institute of Occupational Safety and Health (NIOSH) has a formula for calculating safe levels of noise exposure as related to high level noise impulses such as firearm discharges. Below are some of the acceptable exposures based upon this formula.
One 140db (decibel) noise impulse in a 24 hour period
Five 130db (decibel) noise impulses in a 24 hour period
Thirty-two 125db (decibel) noise impulses in a 24 hour period
One hundred 120db (decibel) noise impulses in a 24 hour period
Three hundred and sixteen 115 db (decibel) noise impulses in a 24 hour period
One thousand 110 db (decibel) noise impulses in a 24 hour period
How do I know if I have enough hearing protection?
You want to keep your noise impulse exposure within the recommended levels shown above. If you are using a standard set of earmuffs that have a 30db noise reduction rating, then you would subtract the NRR rating from the level of the noise impulses you are being exposed to. A .22LR pistol at an indoor range will generate an impulse of approximately 155db. So when you subtract the 30db rating from the 155db noise impulse you will be exposing yourself to 125db. According to NIOSH you will exceed your limit after thirty-two rounds fired.
If my earmuffs don’t provide the protection I need, how do I keep my noise exposure to a safe level?
If you add soft expandable earplugs, in addition to your earmuffs, you will add approximately 18-20db of additional protection on top of your earmuff rating (approximately 50db of total protection). This will greatly extend your shooting time.