What is the name of the simplest eye structure, which is able to perceive light but NOT form an image?

Name: What is the name of the simplest eye structure, which is able to perceive light but NOT form an image?
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The simplest eye structure is called an ocellus. It is a simple eye with a single lens that can detect the presence or absence of light, but cannot form an image like a more complex compound eye. Ocelli are found in many invertebrates such as flatworms, starfish, and insects.

What Is the Name of the Simplest Eye Structure, Which