Permalens contact lenses from CooperVision are spherical lenses designed to give you comfortable, clear vision. The lenses are manufactured to be worn as daily lenses, although, some patients will be able to wear them for up to a week as extended wear lenses, depending on advice from their eye care practitioner.
Lens Material
The lens material, perfilcon A is terpolymer of 2-hydroxyethyl methacrylate, N-vinyl-2-pyrrolidone and methacrylic acid, with ethylene glycol dimethacrylate as the cross linking agent.
| Lens Parameters | |
| Diameter: | 13.5, 14.0 and 14.2mm |
| Center Thickness: | 0.10-0.40 |
| Base Curves: | 7.7, 8.0, 8.3 and 8.6mm |
| Powers: | -20.00D to +8.00D |
| Lens Properties | |
| Refractive Index: | 1.38 |
| Surface Character: | Hydrophilic |
| Water Content: | 71% |
| Oxygen Permeability: | 42.0 x 10-11(cm2/sec) (ml 02/ml x mmHg) at 35 deg. C (The method of Irving Fatt, Ph.D.) |
| Light Transmittance: | >96% |