Are High Index Lenses Aspheric? To make high index lenses even more attractive, most of them have an “aspheric” design. This means that, instead of having a round (or “spherical”) curve on the front surface, these lenses have a curve that gradually changes from the center of the lens to the periphery. Are aspheric lenses
What Negative Visual Effect Is Caused By Curvature Of Field Cresting? This is typically called “pincushion distortion“. Negative distortion decreases the magnification with the most distant points being the most affected. This is called “barrel distortion”. What is field curvature in a lens? Field Curvature, also known as “curvature of field” or “Petzval field curvature”,
How Spherical Aberration Is Corrected? One way a lens can correct for spherical aberration is by adjusting the physical shape of the lens elements. By grinding a lens so that it protrudes more near the center and making some adjustments to the edges, the lens can correct for focusing at the edge and allow all
Why Flat Lenses Sunglasses? Our flat crystal lenses leave more space between your shades and your face for guaranteed comfort and a distinctive silhouette. What are flat lenses sunglasses? Flat Lens Eyewear Each frame now provides ample spacing between your face and the actual frame. All lenses are designed to provide little to no curvature,