What is a freeform optic?
Freeforms are optical shapes or optical surfaces that are designed with little to no symmetry. Manufacturing a freeform is similar to that of a highly complex asphere; surface form and local slope change are all factors that influence the complexity of the shape and the manufacturing process used.
What is freeform design?
Basically, free-form consists of three separate but totally dependent parts—a lens design, a software program, and very specific processing equipment. All lenses designed with digital free-form technology are effectively “optimized” because they can be precisely generated to a power of 0.01D.
What is the difference between digital and FreeForm lenses?
Traditional lenses are surfaced on 1 side and patient’s best vision is in the center of the lens. Digital lenses are surfaced on both sides and often called free-form because the lens is customized to the patient’s prescription in a very precise manner.
What are FreeForm Varifocals?
Freeform varifocal lenses are the most advanced versions of progressive lenses. They are created by computer-driven equipment and are made to suit each individual specification. These lenses are called “back-surface lenses” because of the technology used to create them.
Are digital lenses worth it?
Why are digital lenses important? Digital lenses eliminate many of the aberrations that were unavoidable with conventional lens surfacing. They are six times more accurate than traditional lens surfacing and enable patients to enjoy up to 20% wider vision channels for both intermediate and near distances.
Are digital lenses better?
High-definition, or digital lenses, have been described as the most important improvement in prescription eyewear in the last 100 years. The lenses are available in thin and light materials, making them ideal for long wear, even with the strongest prescriptions. …
What is FreeForm lens technology?
Free-form Progressive lenses are: Individually Measured, Computed and Manufactured Progressive Addition Lenses Using Computer Programs To Run Three-Axis Generators and Polishers to Provide the Wearer With an Optimized Lens Correction For A Visual Defect.
What is the difference between digital and freeform lenses?
Are digital lenses expensive?
They’re more expensive than standard lenses, but we think the price upgrade speaks for itself when you consider the better lens quality. Again, digital lenses are more beneficial the higher your prescription, but the optics are clearer across the board.
Who makes digital lenses?
The three top manufactures of PAL lenses are Zeiss, Essilor and Hoya. A newcomer to the pack is Shamir which also makes excellent lenses.
What is freeform bifocal?
OFFICE Lenses Manufactured with FreeForm technology, in an unspecified segment, designed for near and far vision, bifocal lenses. It allows for a better progression without view distortion in comparison with other classic bifocal lenses.
Are free form lenses better?
In addition to the improved visual clarity that customized free-form lenses provide, you can expect: Exceptional night/low light vision: Free-form lenses can reduce glare and halo effects caused by light sources at night, such as car headlights. Exceptional contrast perception: Free-form lenses can sharpen vision.
Which is the best description of freeform optics?
Tell me the details: Freeform optics involve optical designs with at least one freeform surface which, according to the ISO standard 17450-1:2011, has no translational or rotational symmetry about axes normal to the mean plane. Nonimaging and illumination optics have leveraged freeform surfaces since at least the 1990s [1].
How does a free-form lens design start?
The process starts with a theoretical design model, not unlike conventional PALs, using the front surface, the back surface, or a combination of both.
What do you mean by free form technology?
FREE-FORM TECHNOLOGY Free-form surfacing, also referred to as direct or digital surfacing, refers to a process that is capable of producing complex surface shapes, including aspheric, atoric and even progressive addition surfaces.
What are the benefits of free form lenses?
Free-form lenses may be designed to correct, as much as is optically possible, these compromises, resulting in significantly improved vision.