"Metro" Boston XO Rigid Gas Permeable Contact Lens
TFDA approval# 017403
Description
“Metro” Boston XO Rigid Gas Permeable Contact Lens (hexafocon A) material is used for the manufacturing of daily wear rigid gas permeable contact lenses.“Metro” Boston XO Rigid Gas Permeable Contact Lens are wettable, non-hydrophilic rigid gas permeable contact lenses that are not surface treated and are made from siloxanyl fluoromethacrylate copolymer containing and ultraviolet absorber.“Metro” Boston XO Rigid Gas Permeable Contact Lens are available in blue, ice blue, violet and green.
The physical characteristics of the Boston XO material was designed to facilitate the fabrication of high-quality rigid gas permeable contact lenses in a wide range of lens designs.
Application range
The“Metro” Boston XO Rigid Gas Permeable Contact Lens are indicated for daily wear for the correction of refractive ametropia (myopia, hyperopia, astigmatism less than -4.00D).
Operation & Precautions
Precautions：This device is intended for use by an ophthalmologist.
| Lens Specification | |
|---|---|
| Diameter | 7.00 mm to 12.00 mm |
| Base Curve | 5.00 mm to 11.00 mm |
| Power | -20.00D ~ +20.00D |
| Center Thickness | 0.07 mm ~ 0.65 mm |
| Color | blue, ice blue, violet and green |
| Physical Properties | |
|---|---|
| Specific Gravity | 1.27 |
| Refractive Index | 1.415 |
| Light Absorbance | 8.5 Blue 5.3 Ice Blue 5.3 Violet 4.9 Green |
| Light Transmittance | 92% |
| Surface Character | Hydrophobic |
| Wetting Angle | 49° |
| Water Content | < 1% |
| Oxygen Permeability | 140*(100**) {10-11 (cm³ O2·)/(cm2·sec·mmHg) @ 35°} *gas to gas method **polarographic method (ISO/Fatt) |
“Metro” Boston XO Rigid Gas Permeable Contact Lens when placed on the cornea act as a refracting medium to focus light rays on the retina. The toric lens provides a more even surface over the uneven astigmatic cornea and thus helps to focus light rays on the retina.