Entomopia (literally "insect eye") is the name given to a grid-like pattern of multiple copies of the same visual image; hence, this is a type of polyopia. This phenomenon has been reported in migraine; its pathogenesis is uncertain.
Lopez JR, Adornato BT, Hoyt WF. "Entomopia": a remarkable case of cerebral polyopia. Neurology 1993; 43: 2145-2146