Only by using state-of-the-art lathing technology and computer modelling were No7’s design team able to produce a lens with differing aspheric geometries in the two principal meridians. The result is a lens with an edge clearance and alignment identical to those of a Quasar lens on an eye with no astigmatism.
The Quasar Toric has been designed using the well-established and highly successful Quasar multi-aspheric geometry. Only by using leading-edge lathing and computer modelling were we able to create a lens with varying aspheric geometries in the two principal meridians. This ensures that the edge clearance and alignment of the Quasar Toric are exactly the same as with those achieved with Quasar lens on patients with no astigmatism.
The need to introduce multi-aspheric geometry to toric lenses arises from the fact that the flatter meridian of an astigmatic eye flattens less rapidly than the steeper meridian. A lens with the same relative flattening in the two principal meridians will therefore be too tight in the steeper meridian compared to the flatter.
The resultant ideal fit for Quasar Toric is perfect alignment in the flattest meridian with precisely calculated flattening towards the periphery in the steep meridian to allow excellent movement, optics and corneal health.
In Quasar lenses, the lathe-generated edge form is well-rounded and has a centrally positioned apex 0.12mm thick. All are lenticulated and the form of the front surface is custom designed to maintain the consistent edge and junctional thicknesses needed for maximum comfort and oxygen flow. Where there is a cylinder applied on the front surface the lenticular design is modified to optimise the thickness and thereby the comfort.
The Quasar Toric is always fitted empirically. The laboratory should be provided with the keratometry readings, the spectacle refraction, back vertex power and the total diameter of the lens required. A custom designed lens will be produced for that particular patient which then serves as a trial lens. In the vast majority of
Figure 1 – Ideal Fit
As with Quasar lenses, if the practitioner decides that a larger or smaller lens is ultimately required, no change is made to the
Figure 2 – Quasar Toric Fit
- Unique aspheric geometries for perfect alignment
- Empirical fitting
- High first time success
|Materials||DK60, DK 90, SGP, SGP2 – Others available – Quasar Toric Custom|
|Radii||Flattest meridian 7.00 to 9.00 in 0.05mm steps|
|Max Difference Flat/Steep||2.0mm|
|Total Diameters||8.80, 9.20, 9.60, 10.00mm|
|B.V. Power Range||+25.00 to – 25.00 in 0.25D steps|
|F.O.Z.D||8.00 to 6.00mm depending on B.V.P. and
|Central Thickness||Minimum 0.12mm|
Meet every challenge with the Quasar range of RGP lenses. Range includes: Single Vision, Toric and Multifocal.
No7 Recommends - Ote Fine
All-in-one comfort solution for RGP contact lenses
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