eyeTopics.com - http://www.eyetopics.com
Frequency 55 Multifocal
http://www.eyetopics.com/articles/2244/1/Frequency-55-Multifocal.html
eyeTopics Review Editor
 
By eyeTopics Review Editor
Published on 07/13/2009
 
Frequency 55 Multifocal are disposable contact lenses manufactured by CooperVision.

Frequency 55 Multifocal

Frequency 55 Multifocal are disposable contact lenses manufactured by CooperVision. Frequency 55 Multifocal features Balanced Progressive Technology that combines spherical center zones and aspheric peripheral zones. These two zones work together to provide exceptional distance, intermediate and near vision. Frequency 55 Multifocal contact lenses let you enjoy optimum vision quality at every distance and the freedom of soft contact lenses.

 

Lens Material

The lens material is 55% water and 45% methafilcon A, random copolymer of hydroxyethylmethacrylate and methacrylic acid. The lenses are made by modifying the uncolred methafilcon A lens by affixing a colored pigment on the portion of the front surface that corresponds to the iris. The colored pigments consists of carbazole violet, chromium oxide green, dihydrodnaphto brown, dihydroxio yellow, phthalocyanine green, iron oxide red, iron oxide brown, iron oxide black, phthalocyanine blue, and titanium oxide.

Lens Parameters

 

Chord Diameter:

14.4 mm

Center Thickness:

0.16 mm

Base Curves:

8.7 mm

Powers:

+6.00D to -8.00D sphere (in 0.50 steps >-6.50)

 Addition:

+1.00, +1.50, +2.00, +2.50 progressive D & N lenses

 


Lens Properties

 

Oxygen Permeability (Dk):

18.8

Water Content:

55% by weight in normal saline