Royal Caribbean International Vision class cruise ship

The Vision class is a term Royal Caribbean International uses to refer to six of its cruise ships. Although called a "class" by Royal Caribbean, actually it consists of two pairs of sister ships and another pair of sister ships that was later split up into two different ships by a lengthening of one of the ships. They are not identical to each other and as such do not constitute a class by the actual definition of the term. In fact, the Vision class is named after the last ship built, and formerly the largest ship in its class.