If you wear glasses, you clean them one of two ways: with a microfiber cloth, or — if you’ve been to an optician — with an ultrasonic cleaner. They sound similar. They are not. One wipes the surface; the other cleans the whole pair without touching it. Here’s how they actually compare.
Microfiber cloth: convenient, but limited
A microfiber cloth is what most people reach for. It’s cheap, portable, and fine for a quick touch-up. But it has real limits:
- It only cleans the lens surface. The frame, hinges, and nose pads — where most dirt and bacteria sit — stay untouched.
- It can scratch. Once the cloth picks up dust, you’re dragging hard particles across a softer coating. Over time that means micro-scratches and haze.
- It smears as often as it cleans. On an oily lens, a dry cloth just moves the oil around.
A microfiber cloth is a tool for a quick fix, not a real clean.
Ultrasonic cleaning: how it works
An ultrasonic cleaner fills a small tank with water and sends high-frequency sound waves through it. Those waves create countless microscopic bubbles that collapse against every surface of your glasses at once. The effect lifts dirt, oil, and bacteria off the lens and deep inside the frame — without anything physically touching the glass.
No contact means no scratching. And because the bubbles reach everywhere, it cleans the hinges and nose pads a cloth can never get to.
Side by side
- Cleans the lens: Cloth — partly. Ultrasonic — fully.
- Cleans the frame and hinges: Cloth — no. Ultrasonic — yes.
- Risk of scratching: Cloth — yes, when dusty. Ultrasonic — none.
- Removes bacteria: Cloth — minimal. Ultrasonic — thorough.
- Effort: Cloth — constant re-wiping. Ultrasonic — press once, wait three minutes.
- Best for: Cloth — on-the-go touch-ups. Ultrasonic — a real clean at home.
Is ultrasonic cleaning safe for coated lenses?
Yes — when the device is made for it. Because nothing touches the lens, ultrasonic cleaning is gentler on coatings than any cloth. Lensio is tested specifically on AR, HEV and UV coatings, so it cleans deep without weakening the layers that reduce glare and protect your eyes.
So which should you use?
Keep a microfiber cloth in your bag for quick touch-ups during the day — that’s what it’s good for. But for an actual clean, the kind that reaches the whole frame and keeps your coatings intact, ultrasonic wins on every measure that matters.
The simplest way to think about it: a cloth maintains the look of clean glasses. An ultrasonic cleaner makes them clean. Lensio brings the optician’s method to your bathroom shelf — water, a tablet, three minutes, done.