Contributor content. For millions of people with vision issues, the choice between glasses and contact lenses is an ongoing ...

In a lab in Zurich, scientists have built something that, at first glance, shouldn’t be possible. When a beam of infrared light strikes their ultra-thin lens—barely thicker than a red blood ...

But metalenses—a new class of ultra-thin lenses built from nanoscale structures—are now changing the rules. Physicist Rachel Grange at ETH Zurich. (CREDIT: ETH Zurich) ...

Wearing contacts also plays a role: The thin lenses can reduce the amount of oxygen that reaches the cornea, interfere with the production of tears, and generally irritate and dry out the eyes.

Wearing contacts also plays a role: The thin lenses can reduce the amount of oxygen that reaches the cornea, interfere with the production of tears, and generally irritate and dry out the eyes.