Compound Eye of Bee

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Arthropod eyes are called compound eyes because they are made up of repeating units, the ommatidia, each of which functions as a separate visual receptor.
Compound  Eye of  Bee
© fb.com/SumanKalyanBiswasPhotography
  Like most insects,  bees have compound eyes that are made up of thousands of tiny lenses called ommatidia.

front view of  Bee 
courtesy: google.com

Each ommatidium consists of a lens (the front surface of which makes up a single facet)
a transparent crystalline cone , light-sensitive visual cells arranged in a radial pattern like the sections of  an orange pigment cells which separate the ommatidium from its neighbors.

compound eye of bee
© fb.com/SumanKalyanBiswasPhotography
front view of  Bee
courtesy: google.com

  This allows bees to detect polarized light -- something human beings cannot do. two compound eyes, which are used for distance vision outside of the hive, as well as orienting the bee's flight relative to the sun. Each eye consists of 3000 to 5000 visual processing units called ommatidia. 

 The eyes do not perceive shapes clearly but identify color well. A bee's compound eyes are receptive to ultraviolet light, but less receptive to reds. Bees recognize blue, yellow, white and black. Simple eyes, called ocelli, are found near the front and top of the head. Ocelli register intensity, wavelength, and duration of light. At dusk the ocelli estimate extent of approaching darkness, causing the bees to return to their hives.
                                   
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source: Wikipedia , rcm.com , google.com , science mag. etc



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