No these sunglasses do not need solar power for protecting your eyes but they can be used to power up your gadgets. The SIG, or “Self Energy Converting Sunglasses” is a concept design (like iBangle) having dye solar cells, which can be used to power small devices.
According to their designers,Hyun-Joong Kim & Kwang-Seok Jeong, the dye solar cell is a cheap organic dye combined with nanotechnology to produce energy with high efficiency.

