One of those issues that make the supposed evolution of crustaceans impossible is the eye structure in the lobster and shrimp. A great many life forms belonging to the class Crustacea have refractive-type lens structures. Only two—the lobster and the shrimp—have a reflective mirrored eye. According to the unscientific evolutionist hypothesis, all living things belonging to the Crustacea must have evolved from a common forebear. If this claim were true, then it needs to be proved that the reflective mirrored eye structure also evolved from the refractive type lens structure. Yet such a transition is impossible, because both types function perfectly with their own entirely different systems, and there is no point in looking for any "intermediate" form.For a crustacean to gradually lose the lens in its eyes and for mirrored surfaces to emerge where formerly there had been lenses would leave the invertebrate deprived of sight in the meantime, and it could never survive.In addition, no example of a semi-reflective and semi-refractive eye has ever been encountered in any fossil of any other life form. Every fossil discovered to date had perfect eyes, systems and structures, just like the 150-million-year-old shrimp pictured here.