First and perhaps most obvious, never use a regular towel, paper towel, or washcloth to clean sunglasses. The reason is that these materials are relatively coarse and can leave behind microscopic scratches. The scratches are so small that initially you probably won’t notice, but repeated rubbing with these materials over time can cause an accumulation in the number of these mini-scratches which will ultimately decrease the visual acuity of the lenses. A much better idea is to clean the lenses with a microfiber or lint-free cloth, which can be purchased at pretty much any optical store.
Additionally, never hold your sunglasses by the lenses when you are trying to clean them because this will create smudges on the lenses and, depending on how tight your grip is, could cause microscopic blemishes as well. This might seem really obvious, but I’ve seen so many people do this that it is worth mentioning.
Always hold your sunglasses by the frame when cleaning the lenses.
For particularly dirty lenses, a simple dry rub may not be adequate and may even exasperate the blemishes. In these cases, soapy, warm water can work wonders.
Simply run some warm tap water over the lenses, apply a mild soap, rinse and dry with a microfiber or lint-free cloth. If soapy water is not enough, the next step is to purchase a commercial cleaner designed for sunglass lenses. The most important thing here is to follow the instructions on the bottle as closely as possible, and of course follow the other tips mentioned above. eResearch by Navid Ajamin -- spring 2012
To avoid scratches, blow any debris off the lenses before wiping them. Microfiber cleaning cloths are an excellent choice for cleaning glasses. These cloths dry the lenses very effectively and trap oils to avoid smearing. But because they trap debris so effectively, make sure you clean the cloths frequently.
Wet your lenses with warm water before wiping them with a microfiber cloth. For stubborn smudges or dirt, use a cleanser specifically for eyeglasses or a mild liquid soap. Avoid harsh products, such as window cleaner, bleach, alcohol, ammonia or even vinegar, which can damage the anti-reflective coating.
Opticians can always repair cracked lenses and bent frames; however, if the frames are inexpensive it may be worthwhile to just buy a new pair. It's normal to have light scratches on eyeglass lenses. When the scratches begin to interfere with vision, the lenses should be repaired or replaced immediately.
Reference: matrixeyewear.com trendyoptics.com leaf.tv allaboutvision.com
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