Preference Toric XR contact lenses from CooperVision are designed to correct the vision of patients suffering from astigmatism. The "XR" stands for extended range, giving you a much wider range of prescription choices than the standard Preference Toric lens. Preference Toric XR lenses are made with a visible tint to assist you in finding your lenses in the solution.
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: | 8.0 to 9.5mm |
| Diameter: | 14.0 to 15.0mm |
| Sphere Power: | -20.00 to +20.00D |
| Cylinder Powers: | plano to -12.00D |
| Center Thickness: | 0.07 to 0.78mm |
| Lens Properties | |
| Refractive Index: | 1.43 |
| Surface Character: | Hydrophilic |
| Water Content: | 42.5% |