Helping people see

"Most of us rely on our eyes to see and understand the world. Yet, human eyes are far from perfect. Over the years, we have looked for ways to improve our imperfect sight. Let's meet the innovations that have changed how we see the world. Glasses, goggles, prisms--and so much more. Dive into the world of optics, where light bends to help us see the sights!"--Provided by publisher.