Top opening eyeglass cases is sort of a “slang” term that is used to describe what the industry calls clamshells and flip tops. Clamshell eyeglass cases, just like the name implies, resembles a clam with the way it opens and closes. A flip top is somewhat tubular in shape and has an opening that “flips up” on one end where the eyeglasses can enter.
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top opening, clamshell, flip top and other types of eyeglass cases
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