Physicists in the US have demonstrated negative refraction at optical wavelengths for the first time. Vladimir Shalaev and colleagues at Purdue University obtained the result in a material consisting ...

Refractive index measurement is at the heart of optical science, influencing everything from lens design to material characterization. Modern techniques span from classical prism-based methods to ...

Scientists have demonstrated that negative refraction can be achieved using atomic arrays -- without the need for artificially manufactured metamaterials. Scientists have long sought to control light ...

Please provide your email address to receive an email when new articles are posted on . It would seem logical that emmetropia is the ideal refractive state of the eye. Emmetropia puts far away objects ...

More than 150 million Americans have poor vision because of a refractive error. Refractive errors make your vision blurry or hazy, making reading difficult, and can ...