Dont' wanna be a buzzkill, but I found this quote from Wikipidia interesting.
"2a. Even if a human could somehow harness energy from the sun with the eyes and convert it into necessary food energy and nutrients, the eyes provide a tiny surface area, particularly compared to that of a green plant’s leaves. Further, humans require a far greater amount of energy for sustenance than plants. Sungazing would likely have to be tens or hundreds of times as efficient as photosynthesis in plants to produce enough energy to keep a human being even minimally functional."
Sungazing - Wikipedia, the free encyclopedia