While the simple eye might tell the insect that light is above, the compound eyes provide the detailed map of movement surrounding it. The nervous system processes the contrast and movement between individual facets rather than forming a detailed photograph.
From Nature To Autonomous Flight: How Compound Eyes Inspire Next-Gen Flight Control
This design allows the organism to perceive changes in light intensity across a vast field of view simultaneously. The individual signals generated are not processed into a single coherent image by a brain in the traditional sense; instead, the brain integrates the input from all ommatidia to construct a panoramic picture.
Insects, the most common possessors of this eye type, are preyed upon by fast-moving birds and other insects. Limitations and Trade-offs While superior for motion detection, this eye structure has limitations regarding image resolution.
From Nature To Autonomous Flight: How Compound Eyes Inspire Next-Gen Flight Control
The primary evolutionary driver for compound eyes is the need for speed. Therefore, the purpose of compound eyes is not to read or recognize complex shapes but to survive.
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