Once again we have only assumption. None of that is shown to actually have occurred. Much like the rest of evolution.Do you really think you're asking a question that has not been asked (and answered) already?
Evolution of vertebrate eyes:
http://scienceblogs.com/pharyngula/2007/12/21/evolution-of-vertebrate-eyes/
Evolution of metazoan eyes:
http://scienceblogs.com/pharyngula/2006/11/15/the-eye-as-a-contingent-divers/
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