
Standard vs. Digital PAL
Comparison between Digital Progressives and Standard Progressives
Digital Progressives |
Standard Progressives |
|
Key Hole Effect |
Increases the field of vision thereby improving performance. |
Viewing zone sizes get smaller as add power increases. |
Curve Change |
Freeform lenses reduce unwanted astigmatism and reduce blur and distortion. Freeform lens fix produces a WOW factor. |
The curve change, from distance to near, creates unwanted astigmatism and increases as add power increases causing distortion and blur. |
Variable Inset |
Variable Inset places the near zone correctly in front of converging eye making better near and intermediate vision. |
The near zone is typically inset farther sacrificing the near and intermediate vision. |
Cylinder Power |
With precision back surface freeform lens the axis shift is optimized so the clear vision area is not sacrificed. |
As cylinder Rx's get stronger, the shift in axis significantly reduces the clear area of the vision. |