Editing Compound eye (section)

===Superposition eyes===
The '''superposition eye''' is divided into three subtypes; the ''refracting'', the ''reflecting'', and the ''parabolic'' superposition eye. The '''refracting superposition eye''' has a gap between the lens and the rhabdom, and no side wall. Each lens takes light at an angle to its axis and reflects it to the same angle on the other side. The result is an image at half the radius of the eye, which is where the tips of the rhabdoms are. This kind is used mostly by nocturnal insects. In the '''parabolic superposition eye''', seen in arthropods such as [[mayfly|mayflies]], the parabolic surfaces of the inside of each facet focus light from a reflector to a [[sensor array]]. Long-bodied decapod crustaceans such as [[shrimp]], [[prawn]]s, [[crayfish]] and [[lobster]]s are alone in having '''reflecting superposition eyes''', which also have a transparent gap but use [[corner mirror]]s instead of lenses.