Presbyoptic patients get clear, irritant-free vision from their CIBA Vision Focus Progressive contact lenses because they are replaced with new lenses after one month of use, avoiding the buildup of deposits that can irritate your eyesight and cloud your vision.  You will be able to locate your lenses in the cleaning solution with ease because of the light tint they are infused with.   

Lens Material
The lens material vifilcon A, a hydrophilic co-polymer of 2-hydroxyethyl methacrylate and povidone, USP. The chemical name is poly (2-hydroxyethyl methacrylate-co-ethylene dimethacrylate co-methacrylic acid-g-povidone).

Lens Parameters  
Chord Diameter: 14.0 mm
Center Thickness: 0.10 mm at all minus powers
  0.16 mm at +3.00D (varies with power)
Base Curves: 8.6 mm and 8.9 mm
Powers: -9.00D to +8.00D sphere (0.25D steps)
Lens Properties  
Refractive Index (hydrated): 1.415
Light Transmittance: Visitint 93%
Oxygen Permeability (Dk): 16.0 x 10-11 (cm2/sec)(ml O2/ml x mm Hg), measured at 23 degrees C (Fatt method)
Water Content: 55% by weight in normal saline

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