Quasar

This brilliantly conceived yet simple-to-fit contact lens is the first choice for many practitioners around the world. Thousands of successful long term wearers confirm this enduring product to be the ultimate in its class.

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Superbly conceived and easy to fit, it's the first choice for many practitioners around the world. Plus thousands of successful long term wearers confirm it as the ultimate lens in its class.

Designed by practititoners for practitioners, the Quasar lens is truly aspheric from centre to edge. The central area consists of a modified conic profile, which is designed to flatten at a much slower rate than a fixed elliptical curve. This improves centration characteristics and eliminates any significant positive/astigmatic aberration over the central 7mm. This unique aspheric geometry results in slight apical clearance and close alignment over the mid-peripheral cornea. Edge clearance is achieved by the addition of a second aspheric edge band. Constant apical and edge clearance are maintained independent of base curve and total diameter.

To download the Quasar Fitting Guide Click here

The Quasar lens has been designed to make the transition from fitting spherical lenses to aspheric lenses as straightforward as possible. The initial trial lens selection is based on the corneal cylinder as follows: -

Initial Trial Lens Selection
0.00 to 1.50D Cyl Select lens on flattest K /nearest steeper lens
1.50 to 3.00D Cyl Select 0.10 steeper than the flattest K
Over 3.00D Cyl Consider Quasar Toric

The trial lens is placed on the eye and an assessment of fit is made. Either a flatter lens is selected if the fluorescein pattern is like Figure 1

Figure 1: Flatter Lens Fit

or a steeper lens is selected if the fluorescein pattern is like Figure 2

Figure 2: Steep Lens Fit

Once an optimal fit has been attained, as demonstrated in Figure 3, an over refraction is carried out. An allowance is then made for effectivity and the final radius and power are determined.

Figure 3: Optimal Lens Fit

If the total diameter is considered too small and there is insufficient coverage of the pupil or poor centration, the larger diameter should be ordered with NO CHANGE to the radius or power. If the lens is considered too large and there is insufficient vertical movement with the blink, the smaller total diameter should be ordered, again with NO CHANGE to radius or power.

The final fitting lens should give good vertical movement with the blink and move temporally and nasally looking left and right. Vision should remain clear between blinks and there should be no increased flare from a spot light source in a darkened room. Optimal fitting should result in a very comfortable lens.

Fitting sets are available in 12 or 24 lens sets in either 0.10 steps or 0.05 steps between 7.25 and 8.40mm. A feature of the fitting sets is that the total diameters vary over the range as follows:

Fitting Sets And Total Diameters
FOZD TD
7.25 to 7.55 9.20
7.60 to 8.20 9.60
8.25 to 8.40 10.00

Standard fitting sets have a B.V.P. of -3.00D or +3.00D. However, custom fitting sets can be supplied with a different B.V.P. upon request.

As trial sets are used continually and from patient to patient, it is important that an adequate cleaning and storage regime is adopted. It is also advisable to return the trial set to the laboratory for periodic examination.

Single use trial sets are also available, consisting of eight lenses manufactured in PMMA material, base curves ranging from 7.30 to 8.40mm in 0.10 steps, plano power and 9.60mm diameter. Other parameters can be custom made available on request.

  • Excellent visual performance
  • Optimal balance between transmissability and wettability
  • Exceptional comfort
  • Improved centration and stability of fit
  • Guaranteed reproducibility
  • Choice of lens materials
  • Simulated ordering and fitting available
Parameters
Materials
DK60 Focon 5 (60) Fluoro - Silicone Acrylate
Others available - Quasar Custom
Radii 7.00 to 9.00mm in 0.05 steps
Total Diameters 8.80, 9.20, 9.60, 10.00mm
BV Power Range +25.00 to -25.00 in 0.25D steps
FOZD 8.00 to 6.80mm depending upon B.V.P.
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