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Another common type of lens is the flat top. It is different from a curved top. The difference between the two is the size of the optical center. A flat top 28 will have a small window. A flat top 35 will have a larger window, measuring about 36mm across. Both of these lenses have the same size. When selecting a lens, make sure you choose the right one for your vision needs.<br>https://athriftymom.com/microfiber-cleaning-cloths/
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