Procurve | Custom fit contact lens
ProCurve / ProCurve Toric
The ProCurve is a fully aspheric lens with wavefront front surface optical correction. The ProCurve is the optimum lens for lens fits larger than 9.60mm diameter. Aspherical fitting ensure an optimum fit on larger diameter lenses. Larger diameters can improve stability and initial adaption for new wearers.
Ordering
Ordering by specification based on Initial Trial Lens Parameters below or supplying spectacle Rx, BVD and Ks will generally provide an optimal fitting lens. Trial lens sets are available for spherical BOZR range.
Fitting
- For new wearers instil anaesthetic to stabilise lens fit and optimise initial patient experience.
- Assess lens fit with fluorescein and yellow filter at slip lamp.
- Assess the central 10.0mm area and adjust BOZR in 0.2mm increments if needed.
- With toric lenses note flat axis marks (- -) rotation.
In an optimum fit lenses will move post blink vertically. Toric lenses will also appear as pictured. A lens that rides high and does not move with the lid is a high riding fit. This is usually due to lid interaction and corneal shape, altering the lens will not centre high riding lenses. Some lenses will drop and not move, especially high plus powers, reducing the lens diameter 0.5mm will reduce the weight and thickness of the lens. Low riding lens fits can be tolerated, increase the diameter if the pupil is not covered.
Assess the acuity with a distance chart, check the lens power with spherical over refraction. If the lens is a reading lens in monovision note the minus over refraction for optimum distance. With toric lenses align cross-cyl with the rotation of the flat axis marks.
If either the fit or power of the lens need altered forward the information to the lab or specify the parameters for the new lens.
Procurve Initial Trial Lens Parameters
| 0.00 to 1.75 D Cyl Ks differ up to 0.35 | Base Curve 0.1mm steeper than flat K | Power -0.50 more than spec Rx sphere |
| Over 2.00 D Cyl Ks differ 0.40 or more | KFLAT BOZR -0.05mm KSTEEP BOZR +0.05mm | PowerFLAT -0.25 more than spec Rx PowerSTEEP +0.25 more than spec Rx |
Spectacle Rx should be minus cyl form. Correct for BVD is spec Rx is over +4.50
PCA Features & Benefits
| Feature | Advantage | Benefit |
|---|---|---|
| Aspheric back surface | Enables larger diameters to optimally fit corneas | Improves centration and patient adaption |
| Front wavefront correction | Reduced spherical aberration | Improved vision, less aberrations on decentred fits |
| Lathe2i freeform manufacture | Optimum surface quality and parameter accuracy | Improves comfort and surface quality. Ensures repeatability |
| Optimised thickness profile | Minimised lens weight, minimises lid interaction | Improves comfort and vision |
| Unrestricted material selection | Optimum performance for patient needs | Improves surface quality and patient biocompatibility |