Free Form Lenses
The most popular type HD lenses are lenses free form. «Free form» stands for an advanced manufacturing process that reduces higher order aberrations, such as spherical aberration occurring in spectacles lenses produced with traditional processes and tools.
How they are made..
Manufacturing of digital High Definition lenses is optimized with specialized, surfaces forming, equipment controlled by computer (digital surfacing) and is much more accurate than conventional tools.
In fact, with the technology for making the Free Form lenses we can manufacture lenses wit precision of 0.01 diopters as compared to the conventional tools that are accurate from 0.125 to 0.25 diopters.
Who should wear HD lenses
Almost everyone wearing eyeglasses are good candidates for High Definition lenses, but people with higher degrees in their prescription glasses may notice more benefits than those with very low grades.
This results in better image quality, better peripheral vision, improved contrasts sensitivityand less glare from lights at night.
Conventional lenses often cause dizziness when applied to large curvature skeletons.