Penguins eyes do not reflect light. I took about 200 images in South Georgia Island, none had any reflection in their eyes. You are lucky if you see the eye at all.
At least in this image you can see the eye. You sure that's not the nictitating membrane we see? I'm not sure about penguins and know nothing about them. But Google says: "Like other birds, penguins have a nictitating membrane, sometimes called a third eyelid. This is a clear covering that protects the eye from injury."