Front Surface Innovation

The Camber lens blank features a variable base curve,
a new front surface innovation that provides the
optically ideal base curve in all viewing zones.

Single Vision Blank

The single vision lens blank has one base curve from top
to bottom.

Camber Blank

The Camber lens blank has a patented, continuously increasing base curve, ideal for the increasing power profile of free-form progressive lenses.

Each Camber lens blank comes from a section of the “Elephant’s Trunk” curve, creating a unique variable base curve front surface that continually increases in diopter from top to bottom. This improved front surface profile gives each viewing zone a base curve that is well-suited to its function.

Variable Base Curve

The radius of the blank continually decreases from top to bottom.
From the top of the lens blank to the bottom, the base curve increases up to three diopters. This “stacking of the spheres” is a totally new idea, unique to Camber lenses. This new front surface innovation provides benefits to wearers in both the distance and near zones. Wearers enjoy noticeably increased acuity in the periphery of the distance zone, as well as a reading area that is more comfortable and easier to find with the eye.  

Increasing Curve

The Camber front surface features an increasing base curve from top to bottom: lower diopter in the distance zone, higher diopter in the reading zone. This “stacking of the spheres” is a totally new idea, unique to
Camber lenses.
Digital lens design gives optical designers a lot of power to create lenses that are customized to each patient. But when a progressive lens is made from a single vision lens blank, the uniform front curve creates optical problems that lens designers must digitally correct. Rather than focusing every design decision on achieving a fully personalized lens, some of the design power must go toward “compensation correction.” Camber’s new variable base curve technology reduces the need for compensation correction, allowing more digital design power to be used to refine and customize the design for each individual eye.

Traditional Front Side Progressive

When the progressive design was on the front, there was a “varying” base curve “built in”– a higher base curve in the reading area vs. in the distance area. This is actually the correct optics for visual acuity.

Digital Back Side

Digital surfacing brings the progressive design to the back surface of the lens and no longer has a “varying” base curve “built in” since a single vision front base curve is used. This creates optical problems that must be corrected.

Curve Correction Compensation

Optical designers must first correct the optical problems created by a Single Vision front curve. They are also unfortunately “using up” their design tools for “compensation correction” rather than incorporating the best enhancements for the patient.
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