Translating Multifocal

Horizontal Segment Design

The StraighTop is a translating/alternating multifocal design with a large, superior, front-surface distance-vision segment and a large, inferior, front surface “plus” power near-vision segment.  These segments are joined by a horizontal junction which is usually located 1.0 mm below the centerline of the lens.  The StraighTop can accommodate spherical, aspheric or toric base curve geometry.  

This design is prism-ballasted to maintain alignment, but also maintains clear near acuity with up to 20 degrees of lens rotation.

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


Danker Laboratories

The RGP Multifocal Specialists

(800) 237-9641