Millions of eye drops sold at CVS, HEB, Kroger, Meijer, Walgreens and other stores nationwide are being voluntarily recalled.

The eye is essentially a biological camera. It uses the light around us to create spectacular images that help us navigate the world as visual creatures. Like many modern cameras, the eye focuses automatically. But it can only focus on one thing at a time—specifically, one wavelength, or color, of light.

Looking for the best eye massager for headaches, eye strain and relaxation? I spoke with experts to get their recommendations and advice.