Anti-fog explained: why lenses fog and how to stop it

Fog is just condensation — thousands of tiny droplets scattering light. Anti-fog doesn't stop the moisture; it changes how the water sits on the surface.

Why glass fogs

Warm, humid air — your breath, a heated room, exercise — hits cool glass. Water condenses as microdroplets, and each one bends light differently, so you see white haze.

How anti-fog works

An anti-fog treatment lowers the water's surface tension. Instead of beading into droplets, moisture spreads into a thin, invisible film — light passes straight through and the lens stays clear.

Where it earns its keep

Glasses under masks, ski and swim goggles, camera lenses, bathroom mirrors, helmet visors — anywhere cold glass meets warm air.

Making it last

Apply to a clean, dry lens and spread thin. With regular use, reapply every few days — the film wears off with handling.

Clean first, then protect

The MC Antifog set pairs the cleaner and the anti-fog step, so lenses start clean before you seal in the clarity.