The Menicon EX rigid gas permeable contact lens is a spherical design. The posterior curve is selected so as to properly fit 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 the cornea.
The lens material is a copolymer of fluoromethacrylate, siloxanylmethacrylate and methacrylic acid.
The physical/optical properties of the lens are
|Refractive Index||1.443||ISO/DIS 9914|
|Light Transmittance||>90% (380 to 780nm)||ISO/DIS 8599|
|Water Absorption||Less than 0.5% by weight|
|Oxygen Permeability (Dk)||51×10-11 (cm2/sec)(mLO2/(mL × mmHg))||ISO 9913-1|
Informative : 64×10-11 (cm2/sec)(mLO2/(mL×mmHg)) by the modified method of Irving Fatt
Menicon EX is specifically designed to reduce the burden to the cornea and to enhance smooth tear exchange while maximizing comfort during extended wear.
Both front and back bevels are made in an aspheric configuration with a larger width.
|Front Optic Diameter and Power Range||0.00～±10.00D 7.5mm
|Constant Axial Edge Lift||90.08mm||90.09mm||90.10mm|
|Center Thickness (at-3.00D)||0.15mm|
* Products and availability may vary by country.