Preference

PreferencePreference contact lenses from CooperVision are designed to be worn as daily lenses for up to one month and discarded.  Made from deposit resistant material, Preference contacts ensure that your eyes will be comfortable and healthy.  To promote easier handling, the lenses are made with a visible tint to help you find your contacts in the solution and an inside-out indicator to guarantee proper insertion.

Lens Material
The lens material, tetrafilcon A, is a hydrophilic random terpolymer of 2-hydroxyethyl methacrylate, N-vinyl-2-pyrrolidone and methylmethacrylate joined in a three dimensional network of terpolymer chains by divinylbenzene cross-links.

 

Lens Parameters
Base Curve: 8.4 and 8.7mm
Diameter: 14.4mm
Powers: plano to -20.00D
Center Thickness: 0.03 to 0.082mm

 

Lens Properties
Refractive Index: 1.43
Surface Character: Hydrophilic
Water Content: 43%
Oxygen Permeability: 9.3 x 10-11 (cm2/sec) (ml 02/ml x mmHg) at 35 deg. C  (Fatt method for determination of oxygen permeability)

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