The particular structure of the trilobite eye didn't become the insect eye; it's just an example of a more general structure. Trilobites had calcite (mineral) l

The particular structure of the trilobite eye didn't become the insect eye; it's just an example of a more general structure. Trilobites had calcite (mineral) lenses; insects don't. And they were lenses - proper biconvex lenses - not push-buttons.