PDF file - David Thomas Contact Lenses
PDF file - David Thomas Contact Lenses
PDF file - David Thomas Contact Lenses
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A choice of<br />
disposable lenses from
Visibility Tinted Soft <strong>Contact</strong> <strong>Lenses</strong> For Daily Wear<br />
easy to fit • superb visual performance • consistent reproducibility<br />
• wide range of parameters • free trial lenses<br />
Lens Specifications<br />
material VHT Methafilcon A 55%<br />
bozr 8.60 mm<br />
td 14.30 mm<br />
powers ±0.25D to ±8.00D<br />
(0.25D steps)<br />
-8.00D to -10.00D<br />
(0.50D steps)<br />
dk 17<br />
dk/t 19 @ -3D<br />
ct 0.09 mm @ -3D<br />
oz 8.00 mm @ -3D<br />
et 0.07 mm<br />
Light rays focus at one point because spherical aberration control is incorporated.<br />
The aberration control technology used to manufacture FreshCare<br />
Advance disposable lenses creates an aspherical front surface to focus light<br />
rays at a common focal point, thereby providing greater image resolution<br />
than conventional disposable lenses and an increased depth of focus.<br />
Even patients with astigmatism of up to 1D can benefit from wearing<br />
FreshCare Advance lenses as they will experience a reduction in the circle<br />
of least confusion.<br />
Fitting Guide<br />
Light rays do not focus at one point because of spherical aberration.<br />
Convert the spectacle Rx to its spherical<br />
equivalent and for cylinder powers<br />
between -0.50D and -1.00D add -0.25D<br />
to the spherical equivalent. If the spherical<br />
equivalent is equal to or greater than ±4D<br />
compensate for BVD.<br />
After allowing the lens to settle there should<br />
be between 0.2 mm and 0.5 mm of<br />
movement on blink. Over-refract if necessary.
XC<br />
FreshCare<br />
FreshCare<br />
XC<br />
<strong>Lenses</strong> are a new hydrogel material that offers improved comfort and vision levels for your patient. The material<br />
contains molecules of phosphorylcholine, a substance that is found naturally in human cell membranes and<br />
which attract and surround themselves with water, ensuring lenses stay comfortable for longer.<br />
FreshCare<br />
XC<br />
<strong>Lenses</strong> have great wetting properties which give added comfort to last right through the day. The unique<br />
material actually attracts and holds water molecules. It also provides good oxygen supply for safe daily wear.<br />
FreshCare<br />
XC<br />
<strong>Lenses</strong> have properties that help resist surface deposition which aids and prolongs all day comfort.<br />
FreshCare<br />
XC<br />
<strong>Lenses</strong> now combine the unique material properties with a sophisticated aspheric design giving better<br />
enhanced vision.<br />
FreshCare<br />
XC<br />
S P E C I F I C A T I O N S<br />
Material<br />
Omafilcon A<br />
Indications<br />
Daily wear<br />
Water Content 60%<br />
Base Curve<br />
8.5mm<br />
Diameter<br />
14.2mm<br />
Power Range<br />
+6.00 to -10.00 (-0.50D steps above -6.00D)<br />
Centre Thickness<br />
0.075mm<br />
DK/t 33<br />
Lens Construction<br />
Aspheric back and front surface<br />
Replacement Schedule<br />
Monthly
The FreshCare Toric lens has an advanced back surface design with one diopter of prism ballast which provides exceptional stability.<br />
This lens stability, combined with enhanced optics, results in superior visual performance. A thin edge aids comfort and the highly<br />
reproducible manufacturing processes can be relied upon to provide toric lenses which perform consistently.<br />
Clinical studies highlighted an overall preference for FreshCare Toric against a market leading toric and a specific preference for<br />
insertion and removal qualities. 1.2<br />
1.2 DATA ON FILE<br />
Lens Specifications<br />
material VHT Methafilcon A 55%<br />
bozr 8.60 mm<br />
td 14.40 mm<br />
powers +4D to -8.00<br />
(0.25D steps)<br />
cylinders<br />
-0.75D -1.25D -1.75D -2.25D<br />
10° to 180° (10° steps)<br />
dk 17<br />
dk/t 16 @ -3D<br />
ct 0.105 mm @ -3D<br />
et 0.07 mm<br />
Fitting Guide<br />
Convert the spectacle Rx to minus cylinder<br />
form and for powers greater than ±4D<br />
compensate for BVD. Select cylinder power<br />
closest to vertex corrected cylinder power<br />
and cylinder axis closest to spectacle<br />
refractive axis. After 20 minutes check for<br />
0.2 mm to 0.5 mm movement, stabilisation<br />
of the laser mark and acceptable visual<br />
acuity. If necessary, over-refract.<br />
DAVID THOMAS <strong>Contact</strong> <strong>Lenses</strong> Ltd.<br />
Gatelodge Close, Round Spinney, Northampton. NN3 8RJ.<br />
Tel: +44(0)1604 646216 Fax: +44(0)1604 790366 E-Mail: enquiries@davidthomas.com Website: www.davidthomas.com