The “fogging” of your eyeglass lenses. You’ve encountered it before. It could be something you struggle with all the time. At first, a thin mist collects on your lenses. You may not even be aware of it; the lenses rest only millimeters from your eyes, and you are not focusing on the surface of your glasses but rather looking through them. Gradually, however, you realize that your vision is growing hazy or blurry. Sure enough, water has collected on your lenses and you need to wipe them down.
That doesn’t sound like much of a big deal, and as an isolated incident, it isn’t. But fogging generally reoccurs within minutes. Removing your glasses for a wipe-down isn’t a huge chore by itself, but repeat the process over and over again and it quickly becomes a frustrating, futile exercise. And under certain conditions (while driving, up on a ladder, working in a physically dangerous location, riding a motorcycle, or any number of scenarios that require your full attention and limit the use of your hands) stopping to wipe down your glasses can be a very dangerous prospect. Not wiping them down and allowing fog to obscure your vision can be even more dangerous.
The cause of this constant source of irritation? Condensation, generally brought on by temperature changes or occurring in humid conditions. Leave a warm house or car on a cold winter day, or an air-conditioned room on a hot summer day, and moisture will build up on your lenses. In moist, humid environments, water will collect on the surface of your glasses even if there are no wild shifts in temperature. Even you – or, more precisely, your body heat – can be at fault. Engage in exercise and heat will radiate from your head and face, collect behind your lenses, and cause them to fog.
To combat this annoying and potentially dangerous occurrence, you might consider adding a permanent anti-fog coating the next time you order a new pair of lenses. This coating is generally applied to both sides of your lenses and works to prevent water molecules from coalescing into a layer of moisture that obscures your vision. This type of anti-fog coating is applied once, as your lenses are prepared, and cured by heat or chemical process to form a permanent shield that needs no maintenance or reapplication.
If you have a pair of lenses that work perfectly well (with the exception of the fogging problem) and it’s not yet time to order new lenses, or if you encounter fogging infrequently and know when it will occur, you have another option. There are temporary anti-fog coatings in paste and spray formats that you can apply yourself to any lens. These include:
Fog Free Lens Coating – in a two ounce pump-spray bottle.
Cat Crap Anti-Fog – in a paste format for rub on, rub off protection, available individually or in a care kit that includes a microfiber cloth and multi-headed optical screwdriver.
Cat Crap Anti-Fog – in a spray-on format, available by itself or as part of a larger cleaning care kit that includes a microfiber buffing cloth and optical screwdriver.
Directions are included with any anti-fog coating you purchase. Basically, you apply the substance directly to your lenses, either by spraying on the liquid form or dabbing a bit of the paste on to your eyeglasses. Then you wipe them off and buff them as if you were waxing a car or polishing a table; use a clean cloth to produce small, circular strokes until all traces of the applied product are gone and the lenses are clear. This coating will act in the same manner as a permanent coating but will eventually wear off and need to be reapplied.
If lens fogging is frequent nuisance for you, an anti-fog coating – either of the permanent or temporary variety – should prove a solid, low-cost investment in clear and trouble-free vision.