Taking a basic design principle and applying it with free-form technology, Younger’s Camber finished lenses can deliver benefits.
Free-form processing technology has brought exciting changes to the optical profession, but sometimes the most significant change can be achieved by simply going back to basics. Using software developed by Indizen Optical Technologies (IOT) of Spain, Younger Optics has introduced Camber™ Lens Technology. As the company describes it, Camber is a product of advanced surfacing equipment and optical lens design.
BACK TO BASICS
Camber lenses are designed around the fundamental principle of ophthalmic optics that for every lens power there is an ideal base curve. When this is done, Younger maintains that it produces a lens that offers wide open fields of view through all its zones, clearer optics, and better cosmetics. This principle is the foundation of Camber’s patented new front-surface technology.
By design, a PAL has many powers, thus it theoretically has the need for many ideal base curves. The distance zone calls for a flatter base curve while the near zone has a steeper one with increasing base curves in-between. When a free-form progressive lens is processed from a single-vision lens blank, the various powers must share a single base curve, one that may not be ideal for the intermediate and near zones.
VARIABLE BASE CURVE
Camber lens blanks have a variable base curve front surface that continually increases in dioptric power from top to bottom. According to the company, this unique front surface profile gives each viewing zone a base curve that is well-suited to its function.
Younger points out that when the Rx power of a lens is paired with its ideal base curve, the wearer enjoys clearer vision with minimal oblique astigmatism. When the base curve is outside the ideal range for a given power, the wearer’s off-axis visual acuity diminishes. The further the base curve is from the ideal, the more acuity is affected. Since the near zone will be accessed at an oblique angle in a PAL, if the base curve in the near zone is poorly matched, the patient can experience a reduction in acuity in the intermediate and near zones. Patients with high add prescriptions are even more likely to experience this.
Depending on the Rx, Camber lenses have base curves that increase by up to 3.00D from the top of the lens blank to the bottom. The back surface of a Camber finished lens is a combination of the patient’s Rx, the progressive lens design, and individualization parameters. The lens that’s created is a free-form progressive that Younger claims provides the benefits mentioned above.
Camber-finished PALs promise to provide wearers with an increased positive visual experience, spacious viewing zones, improved peripheral vision, an expanded Rx range, and better-looking lens
profiles. Sometimes the best things happen when you get back to basics.
Randall L. Smith is the Opticianry Program Director at Baker College in Jackson, MI.
WHERE TO FIND IT:
800-366-5367 • camberlens.com