It is a well taken photograph of female Lexias pardalis feeding on rotten durian. The part I like the most is both compound eyes showing eyeshine.
In brief, the compound eyes of butterfly is marked distally by thick facet lens, focus together with the underlaying crystalline cone, primary and secondary pigmented cells, cylindrical structure consists of rhabdomere and visual sense cells. In darkness, the pigment granules are placed at a remote distance from the rhabdom. When the eye is exposed to bright light, they are propelled towards the rhabdom, rhabdom acts as an optical waveguide and thus incident light is propagated until it is absorbed by the visual pigment molecules, part of the light is propagated outside the rhabdon boundary. Therefore, when the small mobile pigment granules accumulate near the rhabdom they there absorbed light from the boundary wave, this reduce the light flux, leading to extinction of the eyeshine (Stavenga & Wunderer, 1999).
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