Focus Monthly Visitint contact lenses are manufactured by CIBA Vision as monthly disposable lenses. Disposable contact lenses greatly reduce the amount of deposits that can bind themselves to your lenses and irritate your eyes. For added assistance, Focus Monthly Visitint lenses are made with a light blue tint to help you locate the lenses in the solution.
Lens Material
The lens material is 55% water and 45% 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 |
| 0.15 mm at +3.00D (varies with power) | |
| Base Curves: | 8.6 mm and 8.9 mm |
| Powers: | -8.00D to +6.00D (0.25D steps) |
| -8.50D to -15.00D (0.50D steps) |
Lens Properties |
|
| Specific Gravity: | 1.12 |
| Refractive Index (hydrated): | 1.415 |
| Light Transmittance: | 93% |
| Oxygen Permeability (Dk): | 16.0 x 10-11 (cm2/sec)(ml O2/ml x mmHg), measured at 23 degrees C (Fatt method) Water Content: 55% by weight in normal saline |