Keeping Safety Glasses from Fogging

Fogged glasses make it hard to see, and workers who can’t see are tempted to push their glasses up or take them off. That’s when eye injuries happen. A few simple habits and the right gear keep lenses clear while they stay in place.

• Construction
• General Industry
• Cold Weather

Why lenses fog

Fog is tiny water droplets that form on a lens when warm, moist air meets a cooler surface. It happens when:

• You go from a cold place into a warm one, or the other way around
• You sweat in hot, humid weather or while working hard
• Your breath rises behind a mask, face covering or respirator
• Goggles or glasses fit tightly and trap warm air with little airflow

What helps

• Buy anti-fog lenses. Many safety glasses and goggles have an anti-fog coating. Some are tested for anti-fog performance and say so on the packaging. A coating wears out, so replace lenses that stop working.
• Use a product made for safety lenses. Anti-fog wipes, sprays and cloths made for safety eyewear leave a thin film that keeps water from beading. Follow the directions and don’t use a product that could damage the lens coating.
• Clean lenses with mild soap and water, then dry them with a clean, lint-free cloth. Clean lenses fog less. See PPE Inspection & Care.
• Let lenses adjust. When you move between hot and cold, give glasses a minute to reach the new temperature before you start working.
• Add airflow. Choose glasses with a bit of space and venting, or a wraparound frame with a gap at the top. Don’t block vents on goggles.
• Take breaks in a cool, dry place when you’re hot and sweating. Wipe sweat from your brow, or use a sweatband under your hard hat.

Fog and masks or respirators

• Make sure the respirator seals at the nose. Air leaking up from the mask is the most common cause of fogging. Check with a seal check each time you put it on. See Respiratory Protection and Fit Testing.
• A full-face respirator or a PAPR avoids the problem because there are no glasses to fog. See PAPRs.
• Cloth face coverings and gaiters don’t seal and push warm breath into your glasses. Use a nose clip if one is allowed, and don’t cover the glasses with the fabric.
• Never make changes to a respirator that could break its seal.

What not to do

• Don’t wipe lenses dry on a dirty shirt. Dust and grit scratch them.
• Don’t use saliva, shaving cream, toothpaste or household cleaners that aren’t made for lenses. They can leave a haze or damage coatings.
• Don’t pull your glasses down to your chin or push them onto your forehead to clear fog while you’re still in the work area.
• Don’t drill, grind or cut with fogged glasses. Stop work first.

When fogging keeps happening

Tell your supervisor. A different style, a face shield, a PAPR, better lenses or a change in the schedule can fix it. Employers must provide PPE that fits and works (29 CFR 1910.132 and 1926.95). See Proper PPE Fit and Heat Illness.

Quick checklist

• Anti-fog glasses or goggles, in good condition
• A safety-lens wipe or cloth in your pocket
• Respirator seals at the nose
• Time to adjust when you change temperatures
• A plan to step away from hazards before you clear lenses

Last updated: October 4, 2026