What is Compound eye?
[[File:Dragonfly compound eyes02.jpg|thumb|200px|[[Dragonfly]] compound eyes]] [[File:FLY EYE.jpg|thumb|right|180px|An image of a house fly compound eye surface by Scanning [[Electron microscope]]]] '''Compound eyes''' consist of many photoreceptor units or '''ommatidia'''. Each 'ommatidium' (singular) is an individual 'eye unit'. The [[image]] [[Perception|perceived]] is a combination of inputs from ommatidia on a [[convex]] surface. Thus they point in slightly different directions. Compared with simple eyes, compound eyes possess a wide-angle view. They can detect fast movement and, in some cases, the [[polarization]] of light.<ref>{{cite journal| url = http://www.suss-microoptics.com/downloads/Publications/Miniaturized_Imaging_Systems.pdf| doi = 10.1016/S0167-9317(03)00102-3| title = Miniaturized imaging systems| year = 2003| journal = Microelectronic Engineering| volume = 67-68| issue = 1| pages = 461–472| author = Völkel R; Eisner M. & Weible K.J.| access-date = 2011-01-17| archive-date = 2008-10-01| archive-url = https://web.archive.org/web/20081001225326/http://www.suss-microoptics.com/downloads/Publications/Miniaturized_Imaging_Systems.pdf| url-status = dead}}</ref> == The general picture == Eyes with resolving power have come in ten fundamentally different forms, and 96% of [[animal]] species possess a complex optical system.<ref name=Land1992> {{cite journal | first1 = M.F. |last1=Land | first2= R.D. |last2=Fernald | year = 1992| doi = 10.1146/annurev.ne.15.030192.000245 | title = The evolution of eyes | journal = Annual Review of Neuroscience | volume = 15 | pages = 1–29 | pmid = 1575438 }}</ref> Image-resolving eyes are present in [[molluscs]], [[chordate]]s and [[arthropods]].<ref name=Frentiu2008>{{Cite journal | doi = 10.1002/bies.20828 | title = A butterfly eye's view of birds | year = 2008 | journal = BioEssays | volume = 30 | pages = 1151–62 | pmid = 18937365 | issue = 11–12| s2cid = 34409725 | last1 = Frentiu | first1 = Francesca D. | last2 = Briscoe | first2 = Adri