Education Center

We're here to help.

Singer Optical offers in person training with you and your staff. We can go over everything from how lenses work to specific product. If you have specific questions about your practice, we will perform a comprehensive practice review, including recommended retail pricing to industry standards.

Column

The Boxing System

What is A, B, ED?
A - The horizontal distance between the furthest temporal and nasal edges of the lens shape. The A measurement is also commonly known as the eyesize.
B - The vertical distance between the furthest top and bottom edges of the lens shape or the distance between the horizontal sides of the box.
Effective Diameter "ED" - Twice the distance from the geometric center of the lens furthest edge of the lens shape. The ED can also be defined as the smallest diameter lens that would cutout, if the frame's geometric center matched the lenses optical center. ED is used in combination with decentration distance to select the minimum lens blank size required to fit a given frame.
These measurements are crucial when ordering uncuts! Correct measurements will not only allow enough lens to cut out, but also allows the free form design to take into account the final lens shape during calculation.

Column

Outline of a Progressive

Need help measuring your progressive lens on the lensometer? Check out the diagram below!

Column

Transitions- more than just Grey and Brown!

· Transitions 8- Available in Grey, Brown, Emerald Green, Sapphire Blue, Amber Brown and Amethyst Purple.

· Transitions XtraActive NEW GEN- Featuring best in class dye packs, Transitions XtrActive New Gen is available for patients who seek faster, darker lenses.

· Transitions XtrActive Polarized- XtrActive Polarized is available for a variable polarization option.

Aspheric vs. Spherical

Conventional lenses have a front surface that is spherical, meaning it has the same curve across its entire surface, much like a baseball.

Aspheric lenses, on the other hand, have a more complex front surface that gradually changes in curvature from the center of the lens out to the edge.

On plus lenses, Aspheric lenses cause less lens to bulge out on the center. This causes the lens to be thinner, lighter, and cause less distortion.

When looking at a grid with aspheric lenses, the grid is in focus across the lens versus being magnified only in the center with distortion toward the edges.

Corridors

The linear distance between the beginning of the power gradient—the Fitting Point—and the target add value, most commonly defined as 85 percent of add power, is called the corridor. The Signature comes in multiple corridor lengths; which length is used depends on the seg height and Rx. Most of the time, the corridor used will be 2-3mm less than the seg height. Thus, a Signature with a seg height of 18mm will have a corridor of 16mm. This means that the patient's eye has to travel 6-8 degrees to go from the optimal reading zone, to the optimal distance zone.

Helpful Links

Online Progressive Identifier

Varilux Availability Chart

Price Lists

Find your price list here, call and ask for the password to view and download!