Don Lindsay tells me that the eye could evolve in a "handful" of mutations. However he couldn't tell me where those mutations occured or what those mutations were. IOW, he, like all the alleged rebuttals, are nothing but "just-so" stories.
I have read most of the peer-reviewed literature on this topic (Behe's IC) and the evidence isn't there. No one knows how the mammalian vision system evolved. No one knows how blood-clotting evolved, or the cilia or any flagella- to name a few structures. Explanations are not to be confused with real evidence. If explanations counted for anything I would have gotten a 4.0 at every level of my education.
Just because we see various levels of vision systems does not mena they evolved from one another.
I may not be able to respond right away...