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Diptera.info :: Miscellaneous :: General queries
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why are eyes shaped?
Sara21392
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Posted on 15-11-2010 09:45
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Hi!
It is a picture of Vespidae, we knew that all of the insects have compound eyes which formed of numerous of ommatidia! I have a question! If you notice in this image, you get noticed about these eyes, why are they shaped? Are they ommatidium or another things? Thank you

Sara (21392)

aria.kcc.shirazu.ac.ir/~bm821384/DSC06604.JPG
 
ChrisR
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Posted on 15-11-2010 09:56
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Welcome to the forum Sara ... I can't answer your question but this isn't really to do with identifying Diptera so I will move the thread to a more appropriate forum, such as the General queries area Wink
Edited by ChrisR on 15-11-2010 09:57
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.
 
http://tachinidae.org.uk
Sara21392
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Posted on 15-11-2010 11:51
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Oh! I'm sorryawkward, I'm a newcomer, because I got it wrong!Frown thanks a lot for your attention and lead me!Smile
Edited by Sara21392 on 15-11-2010 11:56
Sincerely yours
Sara
 
ChrisR
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Posted on 15-11-2010 12:54
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No problem Smile I re-read your question and I think I understand now. Basically the dark shapes that you see on insect's eyes sometimes are an optical effect due to the structure of the ommatidia and the way that light strikes them and then is reflected back to the observer.

You can think of each ommatidium as a transparent cylinder and thousands of similar cylinders are packed together but, as the eye surface curves each cylinder points in a slightly different direction to its neighbours. Generally speaking, light is either bounced off the ommatidia up to your eye (giving you the impression of colour) or when you are looking down directly into the ommatidia it vanishes down into the cylinder and doesn't bounce back out (giving you a black/dark patch). Smile
Edited by ChrisR on 15-11-2010 12:56
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.
 
http://tachinidae.org.uk
Sara21392
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Posted on 15-11-2010 16:23
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Thank you very very much!Smile now a question occurred to me!! This insect exist numerous ommatidia, like many other insects; well, against the large number of ommatidia, why number of optical effects are low and so large? This intensive eye, does not conform with state, slightly! Unless, we accept that, optical reflections state, current only in some ommatidia! Doesn't it?FrownShock
Edited by Sara21392 on 07-12-2010 16:30
Sincerely yours
Sara
 
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