The Asphero-FB is a simultaneous-vision multifocal design
that combines a low-
eccentricity base curve with a
low-eccentricity front surface.
This design provides progressive add power from the center of
the lens to the periphery, offering a valuable alternative to the fitting
challenges that can arise with concentric, tangential and crescent-segmented
While this lens requires absolute centration to produce the
simultaneous-vision effect, it produces good intermediate acuity. As a result,
this lens is often preferred by patients whose professions or lifestyles cause
them to spend time reading computer screens.
Diameters: 8.50 mm to 10.0 mm
Base Curve: 6.50 mm to 8.44 mm
Distance: -20.0 D to +6.00 D
Add Power: +0.75 to +3.00 D
The RGP Multifocal Specialists