I'm trying to identify the basic biological mechanisms for sight.
Could you help me with the least evolvedidentifying any organism that canhas the most basic ability to see objects? Insects have fairly complex visual mechanisms (compound eyes
Most importantly, creatures like dogs, cats, insects are able to not just see light, but are also able to identify objects and other living beings. I feel that an organism could be classified as "being able to see" if it can identify objects and movement and use its "visual sensory organ" to help it move around, locate food, identify species of flies)animals, so isdifferentiate between living and non-living and escape predators if any.
Even if an organism can see just black and white or the most basic perception of sight, it would qualify for what I'm searching for. Is there any other lesser evolvedsuch known organism that has an even moresuch a basic visual perception and has that visual perception and the way its eye+brain perceives images, been studied?
EDIT: The organism shouldI'm not referring to the kind of "photosensitivity" that plants have. Detecting the capability to see and identify objects or living beings or foodpresence and take decisions accordinglydirection of light is not sufficient.