Notice that each of these "dots" have boatloads of other dots- now we'll look at one of them close up. Remember, this is the eye of a fly- think about how small this is!
This is a picture from the electron microscope - these dots are on one of the dots of the eye of a fly. I can't believe the detail! I know, "Calm Down Mrs. Neagle" - it's just that I am truly in awe when I think about what we can do and see now with our current technology.