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

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

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

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.

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

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. 

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 transmissibility and wettability
• Exceptional comfort
• Improved centration and stability of fit
• Guaranteed reproducibility
• Choice of lens materials
• Simulated ordering and fitting available

Parameters