User Manual

Part Number: PFG01017 Page 3 of 17
Revision A Revision Date: July 2016
Introduction
The Frequency™ 55 Toric (Hydrophilic) Contact Lenses are high quality flexible wear contact lenses designed to fit
the majority of patients easily, with good reproducibility, excellent vision and comfort.
For a complete listing of available lens parameters, please refer to the Lens Description section.
Description of the Lenses
Frequency™ 55 Toric Contact Lenses resemble small scleral (haptic) lenses in that they overlap onto the sclera by
about one millimeter. The lens material, methafilcon B, is a random copolymer of hydroxyethylmethacrylate and
methacrylic acid. Methafilcon B has a water content of 55.0% by weight when fully hydrated in normal saline
solution. When produced with a handling tint, the lens material is coupled with C.I. Reactive Blue 4. The handling
tint increases the visibility of the lens when not worn on the eye.
The Frequency™ 55 Toric Contact Lens is manufactured with a torodial posterior optic zone and a spherical
anterior surface with and eccentric lenticular for prism ballast and axis stabilization. This design provides for a
uniform edge thickness.
The fitting of the lens is based on a draping effect of a high water lens. Various base curves are achieved when the
peripheral portion of the lens flexes to the curvature of the cornea. the high water content of the lens combined with
thin lens sections, permits suitable draping across a broad range of corneal curvatures.
The draping effect of the lens automatically adjusts the sagittal height for each cornea. The lens parallels the apex
of the cornea providing broad apical contact of the central cornea, vaulting or clearance of the limbus and light
scleral bearing.
The physical properties of the lenses are:
• Refractive Index: 1.40
• Light Transmittance: Approximately 88%
• Specific Gravity: 1.09
• Water Content: 55%
• Oxygen Permeability: 19.0 x 10-11 (cm2/sec) (ml O2/ml x mmHg)at 25°C
1
Measured by Schema Versatae model 920 connected to a polargraphic cell.
Lens Parameter Availability*
Diameter: 14.4 mm
Base Curve: 8.4 and 8.7
Spherical Power: +4.00 to –6.00 Diopters
Cylindrical Power: -0.75; -1.25 and –1.75
Axis: 10 to 180° in 10° steps
Orientation: One laser mark at 6 o’clock