PDF file - David Thomas Contact Lenses

FreshCareVisibility Tinted Soft Contact Lenses For Daily Weareasy to fit • superb visual performance• consistent reproducibilitywide range of parameters • free trial lensesLens SpecificationsMaterial Methafilcon A 55%Base Curve 8.60 mmDiameter 14.30 mmPowers ±0.25D to ±8.00D(0.25D steps)-8.00D to -10.00D(0.50D steps)Dk 17Dk/t19 @ -3.00DCentre Thickness 0.09 mm @ -3.00DOptical Zone 8.00 mm @ -3.00DEdge Thickness 0.07 mmHandling Tint BluePackaging 3 lenses per packReplacement MonthlyScheduleLight rays focus at one point because spherical aberration control is incorporated.The aberration control technology used to manufacture FreshCareAdvance disposable lenses creates an aspherical front surface to focus lightrays at a common focal point, thereby providing greater image resolutionthan conventional disposable lenses and an increased depth of focus.Even patients with astigmatism of up to 1D can benefit from wearingFreshCare Advance lenses as they will experience a reduction in the circleof least confusion.Light rays do not focus at one point because of spherical aberration.Fitting GuideConvert the spectacle Rx to its sphericalequivalent and for cylinder powersbetween -0.50D and -1.00D add -0.25Dto the spherical equivalent. If the sphericalequivalent is equal to or greater than ±4Dcompensate for BVD.After allowing the lens to settle there shouldbe between 0.2 mm and 0.5 mm ofmovement on blink. Over-refract if necessary.

The FreshCare Toric lens has an advanced back surface design withone diopter of prism ballast which provides exceptional stability. Thislens stability, combined with enhanced optics, results in superior visualperformance. A thin edge aids comfort and the highly reproduciblemanufacturing processes can be relied upon to provide toric lenseswhich perform consistently.Lens SpecificationsMaterial Methafilcon A 55%Base Curve 8.60 mmDiameter 14.40 mmPowers +4.00D to -8.00D(0.25D steps)CylindersAxes-0.75D -1.25D-1.75D -2.25D10º to 180º (10º steps)Dk 17Dk/t16 @ -3.00DCentre Thickness 0.105 mm @ -3.00DEdge Thickness 0.07 mmHandling Tint BluePackaging 3 lenses per packReplacement MonthlyScheduleFitting GuideConvert the spectacle Rx to minus cylinder form andfor powers greater than ±4D compensate for BVD.Select cylinder power closest to vertex correctedcylinder power and cylinder axis closest to spectaclerefractive axis. After 20 minutes check for 0.2 mm to0.5 mm movement, stabilisation of the laser mark andacceptable 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 790366E-Mail: enquiries@davidthomas.com Website: www.davidthomas.com