Paragon Thin contact lenses from Paragon Vision Sciences are gas permeable lenses designed to be worn as daily wear lenses and replaced after up to a year of use. Depending on advice from an eye care practitioner, some patients may be able to wear them as extended wear lenses for up to a week. The posterior curve is selected so as to properly fit an individual eye and the anterior curve is selected to provide the necessary optical power to correct refractive error. A peripheral curve system on the posterior surface allows tear exchange between the lens and cornea. Paragon Thin lenses are manufactured with a visible tint to assist in locating them in the solution.
Lens Material
The Paragon Thin rigid gas permeable contact lens material is 100% Polymer (paflufocon D); a thermoset copolymer derived from fluorosilicone acrylate monomers.
| Lens Parameters | |
| Chord Diameter: | 7.0 to 10.5mm |
| Center Thickness: | 0.05 to 0.70mm |
| Base Curve: | 6.50 to 9.00mm |
| Powers Daily Wear: | -20.00 to +12.00 Diopters |
| Bifocal Add Powers: | +0.25 to +4.00 Diopters |
| Monocentric Bifocal Add Diameter: | 4.0 to 9.0mm |
| Monocentric Bifocal Prism: | 1.0 to 2.5 Diopters |
| Concentric Bifocal Add Diameter: | 2.0 to 4.0mm |
Lens Properties | |
| Refractive Index: | 1.463(Nd at 25 deg. C) |
| Luminous Transmittance: | (Clear) 99% |
| (Sapphire Blue) 94% | |
| (Emerald Green) 95% | |
| Wetting Angle: | (Receding Angle) 12.8 deg. |
| Specific Gravity: | 1.45 |
| Hardness (Shore D): | 85.3 |
| Water Content: | < 1% |