Which feature contributes most to a wide field of view and motion detection in insects?

Which feature contributes most to a wide field of view and motion detection in insects?

• A. Simple eyes
• B. Compound eyes
• C. Ocelli
• D. Antennae

Answer: (B)

Insects achieve a wide field of view and rapid motion detection mainly with compound eyes. Each compound eye is built from many tiny units called ommatidia, each with its own lens and photoreceptors. These ommatidia are arranged around the head, so the combined input covers a large portion of the surrounding environment. The brain compares signals from neighboring ommatidia, allowing quick detection of changes and movement across the visual field. This arrangement emphasizes speed and breadth rather than high detail, making motion detection efficient.

Other structures don’t provide this combination. Simple eyes, or ocelli, mainly sense light intensity and help with orientation rather than forming a wide, motion-sensitive image. Antennae are used for chemical sensing and touch, not vision.