Translating Multifocal
Concentric,
Peripheral Add Design
The Front Surface is a concentric, simultaneous-vision
multifocal design that uses a
central
distance zone and a peripheral near-vision zone. The optics of the near-vision zone are lathed on the front
surface of the lens, allowing the base curve to accommodate spherical, aspheric
or toric geometry.
The design is fit like a single-vision lens in that base
curve selection is conducted to match an even fluorescein pattern. The design is
usually fit “on K” or slightly steeper, depending on the corneal toricity.
The Front Surface requires excellent centering to produce the
simultaneous-vision effect.
This design is preferred for patients with low-add
prescriptions, ranging from +0.25 to +3.00 D, and with cylinder no greater than
+2.50 D.
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
Danker Laboratories
The RGP Multifocal Specialists
(800) 237-9641