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 ...

Refractometers are versatile in their design and use, and are able to provide results as refractive indices, or in other cases, as direct measurements of parameters such as soluble solids, sugar ...