For an eye to serve any purpose at all it has to be connected to a brain. Anything you find resembling an eye in any sort of mollusk or anything else which doesn’t have a brain has to be evidence of experimentation in past ages and not of evolution.
I don't understand your point. First of all, what makes you think mollusks don't have brains? What do you think they're doing with the nerve impulses from those light-receptive cells?
And I don't get the distinction you're drawing between "experimentation in past ages" and "evolution." Evolution is, in a sense, the process of experimenting with different forms over time.