Seriously, you don't think this is funny?
Besides the sheer ludicrousness of this "just so" story, the author forgot to mention how the rest of the creature's support systems (nervous, musculoskeletal, circulatory) were simultaneously and beneficiently 'evolving.' (Neither does the author even attempt to explain how this happened.)
Because we are not sure of the how (was it environmental pressure, sexual selection, etc.). For the longest time we did not know HOW the Sun shone; this did not mean that God was personally keeping it burning until we discovered the secret of fusion.
Did I not bring you enough broomsticks? The eye and the necessary support features co-evolve. Many things happen in parallel out there in the world.
I can't see devoting classroom time to creationists showing how dumb they can be. Your argument amounts to being dragged kicking and screaming and refusing to see. This is not teachable content.
Another thing that the evolutionists like to forget is that the genes of each species, even when coding for the same function, are different from each other. The genes (and there is more than one necessary to provide all the necessary capabilities for eyesight) for the eye are different in each species even though they work towards providing the same functionality. Clearly if each species evolved from each other, if each species was perfected through survival of the fittest, we should see after a while at least, that each species had the exact same gene for each function. Yet this is not the case. A simple proof of it is the fact that although all blood does the same work in different species, blood is not interchangeable between species.