|An image of a house fly compound eye surface by using scanning electron microscope|
A compound eye may consist of thousands of individual photoreceptor units or ommatidia (ommatidium, singular). The image perceived is a combination of inputs from the numerous ommatidia (individual "eye units"), which are located on a convex surface, thus pointing in slightly different directions. Compared with simple eyes, compound eyes possess a very large view angle, and can detect fast movement and, in some cases, the polarisation of light. (Even the trained human eye can determine the orientation of polarized light which manifests in a phenomenon called Haidinger's brush.) Because the individual lenses are so small, the effects of diffraction impose a limit on the possible resolution that can be obtained (assuming that they do not function as phased arrays). This can only be countered by increasing lens size and number. To see with a resolution comparable to our simple eyes, humans would require very large compound eyes, around 11 m in radius.
Compound eyes fall into two groups: apposition eyes, which form multiple inverted images, and superposition eyes, which form a single erect image. Compound eyes are common in arthropods, and are also present in annelids and some bivalved molluscs. Compound eyes, in arthropods at least, grow at their margins by the addition of new ommatidia.
I draw attention to the idea of polarization of light for obvious reasons especially when it comes to communication aspect of light transference. I know there are some who are better educated here.The question is to understand how any sensor that can pick up light differentiation, as if, the sun sweeps across the sky. You would understand that connected to this very focus then is the ability to pick up the very differentiation of light? You see?
If you know how to do that, then how would light communication affect receivers of information that is being broadcasted in the light? There is so much to consider here and that information is contained within this very blog.