CIBA Vision's Focus 1-2 Week Visitint contact lenses are designed to be worn as daily lenses for up to two weeks and discarded. Because Focus 1-2 Week Visitint disposable contact lenses are routinely replaced with fresh lenses, your eyes are kept from being irritated by deposits building up. For ease of use, Focus 1-2 Week Visitint lenses are manufactured with a light blue tint to assist you in locating your 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 | |
| Base Curve: | 8.4mm and 8.8mm |
| Diameter: | 14.0mm |
| Power Range: | -6.50D to -10.00D (0.50D steps) |
| Center Thickness: | 0.06 mm at all minus powers |
| 0.12 mm at +3.00D (varies with power) |
| Lens Properties | |
| Specific Gravity: | 1.12 |
| Refractive Index (hydrated): | 1.415 |
| Light Transmittance: | 93% |
| Water Content: | 55% by weight in normal saline |
| Oxygen Permeability: | 16.0 x 10-11 (cm2/sec)(ml 02/ml x mm Hg), measured at 23 degrees C (Fatt method) |