What are the structure of the eye of crayfish?

The eye of a crayfish is compound, consisting of numerous small visual units called ommatidia. Each ommatidium contains a lens, a crystalline cone, and photoreceptor cells that collectively help the crayfish detect light and movement in their environment. The compound structure allows for a wide field of view and sensitivity to motion, though it provides less detail than a single-lens eye. Crayfish also possess a simple eye, or ocellus, which helps them detect changes in light intensity.