PARIS — A new formula based on precise measurements of the eye allows IOL power calculation without a surgeon “fudge factor,” according to presenters here. The formula is accurate even for eyes that ...

Researchers in Korea have created a new metamaterial with the most extreme positive index of refraction yet – a whopping 38.6. The metamaterial operates at terahertz frequencies and the team believes ...

Recent experiments that demonstrate the negative refraction of light could bring a heated scientific debate to a close, and give negative-index materials a positive future Figure 1: Negative-index ...