Design by RX

[OPTIDONN]

I know that Percepta has a 'Design by Rx' feature where as the base curve changes so does the design in anticipation of the RX that would be used in that base curve. Do any other lenses use this system? Is SOLA the only company that does this?

[peng]

the progressive of rodenstock also have the different base curves which have different design.but this only contains inter movement feature.I don't know much about the tech and system you have mentiont above which sola used.can you explain it clearly?

[DaveD]

I know that Percepta has a 'Design by Rx' feature where as the base curve changes so does the design in anticipation of the RX that would be used in that base curve. Do any other lenses use this system? Is SOLA the only company that does this?

The Hoya Summit series, Shamir Genesis and Piccolo and many other better quality progressives take the patients rx into account when processing the prescription. The base curves and add insets (variable inset) are changed accordingly.

[peng]

I don't know much about the tech and system you have mentiont above which sola used.can you explain it clearly?what factors do sola consider when they produce PAL lenses?

[Darryl Meister]

We should clarify the difference between the various flavors of "Design by Rx" technology. What many manufacturers mean by the use of this phrase (or similar phrases) is that the progressive lens design is refined slightly based upon the prescription range of the base curve. This generally includes 1) Varying the inset in order to compensate for the effects of prism from the Distance Rx and 2) Varying the asphericity of the distance zone in order to compensate for peripheral aberrations in cosmetically flattened designs -- as you would in a single vision aspheric lens series. The basic lens design, which includes the viewing zone configuration, corridor length, and design of periphery, does not generally change in these lenses.

The Design by Prescription(tm) technology that SOLA utilizes, on the other hand, actually varies the basic progressive lens design from base curve to base curve. For instance, the distance zone is slightly wider in the flatter base curves, while the near zone is slightly wider in the steeper base curves. This is done to ensure a more consistent field of view, regardless of prescription. While SOLA's progressive lenses also offer variable insets and asphericity, we were referring to these changes to the basic lens design when we coined the phrase "Design by Prescription." This technology was originally developed for Percepta, but was also used for SOLAMAX and SOLAOne.

I am aware of very few competitive lenses that offer significant variations to the basic lens design by base curve. (Essilor Ovation comes to mind as one of the few.) Some lens designs offer variations by Add power, only, as well. Progressive lenses that vary the basic design by just the Add power are often called "Multi-design" lenses. Some "Multi-design" designs simply vary the near inset based upon add power. Many progressive lenses that employ changes to the basic lens design by base curve (Distance Rx) also employ changes to the design by Add power. Consequently, "Design by Prescription" technology often incorporates "Multi-design" technology, as well.

[peng]

Thank you!How to polish the glass PAL mould?Are there any problems in producing high index semi-finished PAL?

Best regards,

peng