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Fly eye colour after death

I am amazed at the vibrant colouring of certain flies eyes, espicially horse flies.

Why is it that they fade after death, why is the colour not frozen ! (is there anyway to preserve the colour).

What gives the horse fly the amazing colours in the first place !, is it like blood flowing through our veins that give us (humans) colour.

If anyone has any info it would be appreciated.

Thanks.

honestly
not much is known about this. If the horse fly is preserved in ethanol, the eye color is preserved. Therefore it is likely that the color is structural but needs a liquid to be seen. The different colors especially in deer flies are thought to help the fly shade out different colors in its environment so that it can see better. It's almost embarassing how little is known about this, even among experts.

 
Thanks Keith,
How or what exactly does a fly see ?

I know the mosquitos seem to find me out doors no problem, is that to do with a heat signature I am producing ?

Is the fly eye image made up of for want of a better word pixels, all containing an image and then those images come together to produce a picture ?

Thanks

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