The Essential Multifocal lens is made using proprietary S-Form manufacturing process and is the leading selling multifocal design in the USA RGP market.
The manufacturing process creates an S”-Form” posterior power gradient which compresses more effective ADD correction (up to +2.75D) within a usable optical area at the centre of the lens. This provides true aspheric optics with a continuous gradient of power that is truly optical from edge to edge. The usable ADD is contained along a shorter radius of axial centre of the lens in a usable optical area. This leads to a greater ADD correction with minimal impact on contrast sensitivity.
And now with anterior surface CSA enhancement (concentric S-Form add), an even broader range of reading adds are possible from +0.50D to +4.00D.
For fitting guidelines click for PDF file
DTCL Essential Multifocal calculator download page
