Pentacam and corneal topography were more sensitive to tear film abnormalities when measuring the curvature of the cornea in ...

For most of us, mirrors are something we buy instead of build. However, [Unnecessary Automation] wanted to craft mirrors of his own for a custom telescope build. As it turns out, producing ...

Sigma has announced a series of super-bright cinema primes, along with rebodied versions of its fast photo zooms.

By carefully placing nanostructures on a flat surface, researchers have significantly improved the performance of so-called optical metasurfaces in conductive plastics. This is a major step for ...

Photo: Charles Brooks The photo above may look like a city or some sort of industrial plant, but it's not: it's actually the ...

Linköping University researchers achieve a tenfold performance boost in conductive polymer metasurfaces, advancing the field ...

By carefully placing nanostructures on a flat surface, researchers at Linköping University, Sweden, have significantly ...

Biomedical engineers at Duke University have developed a computational imaging system that borrows techniques from astronomy ...

For example ... or adhesive cement. Some lens designs require cementing elements together in a dust-free environment. In these cases, balsam cement is used to bond concave and convex surfaces ...

A plano-concave lens is a lens with one side being flat and the other side being concave. It is characterized by being thin in the center and thick at the edges, and can make parallel light rays ...

A glasses lens can curve inward–called concave – to fix near-sightedness. Or the lens can curve outward – called convex – to fix far-sightedness. You can tell what kind of lenses you have ...