Menicon EX

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
Surface Characteristics Hydrophobic
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


Lens Design

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.

Overall Diameter 8.8mm 9.2mm 9.6mm
Optic Diameter 97.4mm 97.6mm 97.8mm
Front Optic Diameter and Power Range 0.00~±10.00D 7.5mm
±10.25~±25.00D 7.0mm
Constant Axial Edge Lift 90.08mm 90.09mm 90.10mm
Edge Radius 0.055mm
Center Thickness (at-3.00D) 0.15mm




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