Yes it needs to be cleaned, it is a toaster/toaster oven.
ClearShield is not a type of material, it's what is called an Anti-Reflective Coating. It has no effect on the thickness of your lenses. If you want to get thinner lenses, then you should go with a Hi-Index material. Try to stay away from Polycarb material since it is the worst material to look through. Trivex, 1.60 or 1.67 Hi Index material should be your materials of choice. Now, back to ClearShield: If you have a higher order prescription, then it would be advisable to have an Anti-Reflective coating put on. Most Hi-Index lenses only let about 93% of the light through, the other 7% bounces off the lens. I call the light bouncing off the lens flair but you see it as glare, mostly at night. Anti Reflective coating allows 99% of the light to pass through the lens. This does two things: 1. It makes your lens almost disappear, but that's just cosmetic. 2. With 99% of the light coming through, the more light that get's through, the better you see and the sharper and clearer objects are and the less glare there is at night. We recommend it for Everyone, except children. Take care, though. Get the Premium AR coat. The other cheaper brands smudge, smear, crack and scractch easily. That being said, if you do get it, you must ALWAYS wet it down with Anti Reflective spray cleaner or water (nothing else) and rinse it off with a clean, soft cloth EVERYTIME you clean the lenses - otherwise the AR coat is going to scratch.
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