by *Blepharopsis
"Projection of confocal microscope optical sections showing three out of eight (but you may flip it along the vertical axis and you end up having six - 75% success rate!) eyes of a jumping spider.
It's funny how the eyes of the spider remind rather those of vertebrates than insects - they are simple, as opposite to compound, have single large lens and a retina.
The two big Anterior Median eyes in the middle are long and tubular and hence have longer focal length, something akin to a telephoto lens, but which means they have a narrow field of view.
The narrow field of view means that the spider has to move its body to see in different directions, however, the eyes can move as well - or rather the retina, since the eyes are build in the carapace. You can see the retina, composed of 4 layers of tiny sensory cells, in the middle of the image. The muscles thatt accoplish its movement are visible below the lens as two bright blue tripes.
Nuclei - red (also, autofluorescence of the lenses' "coating")
Actin - blue"
