Safety & Protection · 7 min read
Safety glasses and hearing protection: ANSI Z87.1, NRR and what you actually need
How to read Z87+ markings on safety glasses and NRR ratings on ear plugs and earmuffs, and how to match protection to the tools you use.
By OUTROOM Field Desk · Updated
Key takeaways
- Look for ANSI Z87.1 marking on safety glasses; Z87+ means the lens passed high-velocity impact testing.
- Anti-fog and wrap-around frames matter as much as the rating: you have to keep them on.
- Hearing damage risk starts around 85 dB over time; most power tools are louder.
- Choose NRR 25-33 for power tools, and double up plugs and muffs for chainsaws.
Eyes and ears are the two things power tools damage quietly. A grinder spark or a sliver of wire takes a second; noise damage builds up over years. The right gear is cheap, light and easy to keep on if you choose well.
/ Reading safety glasses markings
- Z87: meets the basic impact standard.
- Z87+: passed the high-velocity and high-mass impact tests. Choose this for grinding, cutting and striking.
- U6 or similar: UV protection for outdoor work.
- Anti-fog coating: essential with masks, in humidity and in cold weather.
/ How loud are your tools?
| Tool | Noise level | Suggested protection |
|---|---|---|
| Cordless drill | 80-90 dB | Plugs for long sessions |
| Impact driver | 95-105 dB | Plugs or muffs |
| Angle grinder | 95-105 dB | Plugs or muffs |
| Circular saw | 100-110 dB | Muffs, NRR 25+ |
| Chainsaw | 105-120 dB | Plugs under muffs |
/ Understanding NRR
NRR (Noise Reduction Rating) is measured in a lab. Real-world protection is lower, especially if plugs are not inserted deeply or muffs sit over glasses arms. Roll foam plugs thin, insert them fully and hold them while they expand.
/ Frequently asked
Are regular glasses safety glasses?+
No. Prescription glasses are not impact rated unless marked Z87. Wear over-glasses safety goggles or rated prescription safety glasses.
Ear plugs or earmuffs?+
Plugs are light and cheap; muffs are quick to put on and off. For very loud tools, wear both.
What does Z87+ mean?+
The lens passed ANSI high-velocity impact testing, the level you want for grinding, cutting and hammering.