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Which is the least evolved organism that can seepoint us to the evolution of sight?

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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.

I'm trying to identify the basic biological mechanisms for sight.

Could you help me with the least evolved organism that can see? Insects have fairly complex visual mechanisms (compound eyes of flies), so is there any other lesser evolved organism that has an even more basic visual perception and has that visual perception and the way its eye+brain perceives images been studied?

EDIT: The organism should have the capability to see and identify objects or living beings or food and take decisions accordingly.

I'm trying to identify the basic biological mechanisms for sight.

Could you help me with identifying any organism that has the most basic ability to see objects?

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 animals, differentiate 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 such known organism that has such a basic visual perception and has the way its eye+brain perceives images, been studied?

I'm not referring to the kind of "photosensitivity" that plants have. Detecting the presence and direction of light is not sufficient.

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I'm trying to identify the basic biological mechanisms for sight.

Could you help me with the least evolved organism that can see? Insects have fairly complex visual mechanisms (compound eyes of flies), so is there any other lesser evolved organism that has an even more basic visual perception and has that visual perception and the way its eye+brain perceives images been studied?

EDIT: The organism should have the capability to see and identify objects or living beings or food and take decisions accordingly.

I'm trying to identify the basic biological mechanisms for sight.

Could you help me with the least evolved organism that can see? Insects have fairly complex visual mechanisms (compound eyes of flies), so is there any other lesser evolved organism that has an even more basic visual perception and has that visual perception and the way its eye+brain perceives images been studied?

The organism should have the capability to see and identify objects or living beings or food and take decisions accordingly.

I'm trying to identify the basic biological mechanisms for sight.

Could you help me with the least evolved organism that can see? Insects have fairly complex visual mechanisms (compound eyes of flies), so is there any other lesser evolved organism that has an even more basic visual perception and has that visual perception and the way its eye+brain perceives images been studied?

EDIT: The organism should have the capability to see and identify objects or living beings or food and take decisions accordingly.

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