For 10 points, identify this organ whose retina detects photons, enabling vision.
In arthropods, this structure is composed of multiple ommatidia. Crystallins are responsible for the transparency of a part of this structure that is controlled by the ciliary muscles. In reptiles, it is covered by the nictitating membrane. The most basal organisms to possess a homologue of it are the euglenids, which use chromophores rather than rhodopsins. A scotopic process in this organ occurs mostly in cells outside the macula. In cephalopods, this organ is polarization-sensitive, and the nerve that receives sensation from it lies behind the rods and cones, eliminating the blind spot. For 10 points, identify this organ whose retina detects photons, enabling vision.
In arthropods, this structure is composed of multiple ommatidia.
eye [accept eyespots; accept compound eye; prompt on “lens”] &lt;AS&gt;