You can read the story here, but the gist is that compound eyes don't appear to have changed much over the last several million years. At the risk of sounding like a broken record, are any of us really that surprised?
And that's the real trick, isn't it? Eyes, in spite of evolutionists best efforts, do not seem to have evolved slowly over time. Creatures with fully-formed eyes have always appeared to have them. Creatures with "light sensitive patches" have always had (and still have!) those.