PDF file - David Thomas Contact Lenses

A choice of
disposable lenses from

Visibility Tinted Soft Contact Lenses For Daily Wear
easy to fit • superb visual performance • consistent reproducibility
• wide range of parameters • free trial lenses
Lens Specifications
material VHT Methafilcon A 55%
bozr 8.60 mm
td 14.30 mm
powers ±0.25D to ±8.00D
(0.25D steps)
-8.00D to -10.00D
(0.50D steps)
dk 17
dk/t 19 @ -3D
ct 0.09 mm @ -3D
oz 8.00 mm @ -3D
et 0.07 mm
Light rays focus at one point because spherical aberration control is incorporated.
The aberration control technology used to manufacture FreshCare
Advance disposable lenses creates an aspherical front surface to focus light
rays at a common focal point, thereby providing greater image resolution
than conventional disposable lenses and an increased depth of focus.
Even patients with astigmatism of up to 1D can benefit from wearing
FreshCare Advance lenses as they will experience a reduction in the circle
of least confusion.
Fitting Guide
Light rays do not focus at one point because of spherical aberration.
Convert the spectacle Rx to its spherical
equivalent and for cylinder powers
between -0.50D and -1.00D add -0.25D
to the spherical equivalent. If the spherical
equivalent is equal to or greater than ±4D
compensate for BVD.
After allowing the lens to settle there should
be between 0.2 mm and 0.5 mm of
movement on blink. Over-refract if necessary.

XC
FreshCare
FreshCare
XC
Lenses are a new hydrogel material that offers improved comfort and vision levels for your patient. The material
contains molecules of phosphorylcholine, a substance that is found naturally in human cell membranes and
which attract and surround themselves with water, ensuring lenses stay comfortable for longer.
FreshCare
XC
Lenses have great wetting properties which give added comfort to last right through the day. The unique
material actually attracts and holds water molecules. It also provides good oxygen supply for safe daily wear.
FreshCare
XC
Lenses have properties that help resist surface deposition which aids and prolongs all day comfort.
FreshCare
XC
Lenses now combine the unique material properties with a sophisticated aspheric design giving better
enhanced vision.
FreshCare
XC
S P E C I F I C A T I O N S
Material
Omafilcon A
Indications
Daily wear
Water Content 60%
Base Curve
8.5mm
Diameter
14.2mm
Power Range
+6.00 to -10.00 (-0.50D steps above -6.00D)
Centre Thickness
0.075mm
DK/t 33
Lens Construction
Aspheric back and front surface
Replacement Schedule
Monthly

The FreshCare Toric lens has an advanced back surface design with one diopter of prism ballast which provides exceptional stability.
This lens stability, combined with enhanced optics, results in superior visual performance. A thin edge aids comfort and the highly
reproducible manufacturing processes can be relied upon to provide toric lenses which perform consistently.
Clinical studies highlighted an overall preference for FreshCare Toric against a market leading toric and a specific preference for
insertion and removal qualities. 1.2
1.2 DATA ON FILE
Lens Specifications
material VHT Methafilcon A 55%
bozr 8.60 mm
td 14.40 mm
powers +4D to -8.00
(0.25D steps)
cylinders
-0.75D -1.25D -1.75D -2.25D
10° to 180° (10° steps)
dk 17
dk/t 16 @ -3D
ct 0.105 mm @ -3D
et 0.07 mm
Fitting Guide
Convert the spectacle Rx to minus cylinder
form and for powers greater than ±4D
compensate for BVD. Select cylinder power
closest to vertex corrected cylinder power
and cylinder axis closest to spectacle
refractive axis. After 20 minutes check for
0.2 mm to 0.5 mm movement, stabilisation
of the laser mark and acceptable visual
acuity. If necessary, over-refract.
DAVID THOMAS Contact Lenses Ltd.
Gatelodge Close, Round Spinney, Northampton. NN3 8RJ.
Tel: +44(0)1604 646216 Fax: +44(0)1604 790366 E-Mail: enquiries@davidthomas.com Website: www.davidthomas.com