Image Reproduction Integrating System

The Image Reproduction Integrating System also known as IRIS was a device that was capable of translating thoughts into pictures. The Third Doctor had access to one when he worked for UNIT. He used it on Professor Clegg in order to confirm that he had telepathic powers. The Doctor and the Brigadier used it to view Clegg's visions of Drashigs and giant spiders. (DW: Planet of the Spiders)