By Chris Deziel Updated Mar 24, 2022
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An anti‑reflective (AR) coating can dramatically improve vision, especially in bright conditions such as snowy scenes. However, when the coating becomes scratched or damaged, it can actually hinder sight. While AR coatings are not intended to be removed, the process is possible with the right approach—different for plastic and glass lenses.
AR layers are ultra‑thin metal oxides deposited in a vacuum chamber. Electrons carry the coating material, creating a strong electrostatic bond that is far more resilient than a simple adhesive. Because of this bond, conventional abrasion or scraping can damage the lens if the coating is applied in this manner.
Polycarbonate or other plastic lenses can tolerate a chemical etchant. A common solution contains sulfuric acid; some products use hydrofluoric acid. Apply the etchant with a non‑abrasive cloth, let it sit for the time specified in the instructions, then wipe it away and rinse the lenses with soap and water. Always read the product guidelines before use.
For glass lenses, the only viable method is gentle mechanical removal. Use a plastic scraper—such as a stove scraper—to avoid scratching the glass. Before scraping, soften the coating by soaking the glasses in a 90 % isopropyl alcohol solution (diluted with a little water) for at least 10 minutes, preferably 30 minutes to an hour. Once the coating is pliable, scrape it off within 10 minutes, then clean the lenses thoroughly with soap and water.
These steps help restore clear vision while minimizing damage to your glasses.
