Template:POTD/2015-05-31
Compound eyes on a blue bottle fly. Unlike simple eyes, which have a single concave photoreceptive surface, compound eyes consist of a number of individual lenses (called ommatidia) laid out on a convex surface; this means that they point in slightly different directions. Compound eyes provide a wide field of view and can detect fast movement, but have low resolution.Photograph: JJ Harrison
 | This picture of the day has been featured on Portal:Arthropods. |