Optact Overnight Wear Orthokeratology Contact Lens

DOH Medical Device Import No. 005961

Operation & Precautions

Precautions：

This device is intended for use by an ophthalmologist.
To maintain the orthokeratology effect of myopia reduction, overnight wear must be continued on a prescribed schedule. Failure to do so can affect daily activities (e.g., night driving), visual fluctuations and changes in intend correction.

Lens Specification
Chord Diameter	9.6mm to 11.6mm
Base Curve	7.30mm to 10.15mm
Center Thickness For low minus lens Far plus lenses	0.20mm to 0.32mm 0.20mm to 0.32mm
Reverse Curve Steeper than the base curve in proportion to the amount of correction	5.0mm to 9.0mm
Alignment Curve 1 Steeper than the base curve but flatter than the Reverse curve. Generally equal to the Flat K of the cornea being fit.	7.0mm to 9.0mm
Alignment Curve 2 Steeper than the base curve but flatter than AC1 and Reverse curve.	7.25mm to 9.25mm
Peripheral curve	9.00 mm to 15.00mm
Back Vertex Power	+1.50 to -5.00 Diopters

Physical Properties
Specific Gravity	1.24
Refractive Index	1.423
Light Absorbance	10.0 Blue 4.8 Green 10.3 Yellow 2.5 Red
Wetting Angle	30 degrees by CaptiveBubble
Water Contact	<1%
Oxygen Permeability	127(85) {x10-11 (cm2/sec)/(ml O2 x mmHg) @ 35°} gas to gas method **polarographic method (ISO/Fatt)
Hardness	114 Rockwell

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