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Lens Geometry

Wave, with the designer's input, offers starting design options for single vision, toric, multifocal, ortho keratology and hybrid lens designs. Regardless of the design, Wave produces a lens that is thinner, more comfortable and better centered.

 

One of three lens types is selected after considering Rx and corneal shape: RSym, GSym or FForm (respectively Rotationally Symmetrical, Geometrically Symmetrical, Free Form asymmetric). Think of the types as spherical, toric and asymmetric toric.

 

The software always defaults to the simplest design: single vision Rotationally Symmetric. Up to a certain amount of astigmatism, this initial design may be sufficient. If the designer feels there is too much clearance in the simulated fluorescein, he may opt to design in the GSym mode for a full toric design. Taking this process a step further, for more extreme corneas, the designer make take full advantage of Wave's controls and enter the Free Form mode to design asymmetrically.

Three Lens Geometries

 

Optimizing a Wave fit is accomplished by adjusting the height of eight meridians. Depending on the selected geometry, the designer has differing control of the meridians.

 

Rotationally Symmetric: Spherical shaped geometry. Adjustment of any of the eight meridians has the same equal effect on all meridians.

Geometrically Symmetric: Toric shaped although the toricity is only cut where needed. Adjustment of a semi-meridian of one of the eight meridians only effects the  symmetrical semi-meridian of that meridian.

Free Form: Asymmetric geometry. Adjustment of a semi-meridian of one of the eight meridians only effects that semi-meridian with no effect on the reciprocal semi-meridian.

Single Vision Lens Design

Wave's single vision designs are the foundation for all of our designs. First and foremost to success for any of our designs is proper fit. All Wave designs begin with our Multiple Aspheric Design concept. Each lens design consist of multiple curves as small as 10 microns. Compare the resulting 100s of curves to other labs 3, 4, 5 or 6 curves and you appreciate the difference Wave makes. Even a standard aspheric lens is simple compared to a Wave design.

 

All of Wave design controls are available with single vision design except the multifocal controls. But once you do enter additive power, the lens does become a multifocal. Likewise, if you enter astigmatism, the resultant power is spherical equivalent and the design remains 'spherical'. But as soon as you enter an astigmatic over refraction the design becomes a front surface toric. But keep in mind that our thinner lens capability often lets you avoid moving up to a toric design.

Toric Design

Conventionally made toric designs typically cut a lens so that the cylinder is the same power across the entire axis. Wave is much, much different, only cutting the toric shape where needed.

 

Take the 5.25 diopters cylinder below. The astigmatism is centrally contained in the topography map on the right. The map on the left is produced by the Wave software and shows the back surface of the lens. Notice how the astigmatism is only cut in the central portion of the lens. Makes sense doesn't it?

 

 

Depending upon the lens type selected (RSym, GSym or Free Form) astigmatism in the Rx is treated differently. In the RSym mode astigmatism is treated as Spherical Equivalent. But in GSym and Free Form mode, the astigmatism is cut on the back surface. Over refractions are are placed on the front surface of all three lens types. The same is true if you require a second or third compound over refraction.

Why Wave Toric?

 

Atoric optics create spherical effect regardless of orientation

Lens is toric where it needs to be, not across the entire lens

Edge is same thickness around the entire 360º. Below left is a map of the back surface ot the lens. Notice how it follows the cornal shape on the right.

Multifocal Lenses

Wave's multifocal designs take full advantage of the Wave system. As with all designs, attention is given to the lens periphery for precise centration. At the same time. the proper tear film thickness is optimized across the lens until the designer is satisfied with the simulated fluorescein map.

 

You may select one of three designs: center distance, center near or segmented. Most popular is center near; the other options are often used for smaller pupils.

 

The schematic images show a center distance (darker circular area) centered above the pupil. Adjusting the diameter of the center zone (0.1mm steps) facilitates that the annular multifocal (yellow ring) is positioned to bisect the pupil for simultaneous vision. Slight differences in diameter might be in order for dominate and non-dominate eyes.

 

Suppose a center distance lens is dispensed. The patient is  happy with their distance vision but wishes for better near vision. Adjustment is  simple: make the center distance a little smaller to make annular near zone larger.

 

Keratoconus Design

Wave doesn't offer a specific keratoconus design but rather designs a lens that fits a keratoconic eye. Each lens is designed to fit the cone.

 

For example take the cone below (right). The resultant lens design (lower left) shown on the left is produced by the Wave software and shows the back surface of the lens. Notice how the geometry is off center to accommodate the position of the nipple cone.

Why Wave for Cones?

 

Each lens is specifically designed for each cone.

Easily adjust the OAD to as large as 18mm.

Control tear film thickness to vault if desired.

Hybrid design option creates a toric periphery with a spherical center for less complicated optics.

Freeform Design

Wave Free Form design is unlike any other. In fact no other company offers anything remotely close.

 

Simply put, free form designs are asymmetric. The designer may make adjustments with an effect over 90, 180 or 360  degrees of the lens.

 

Why Wave Free Form?

 

May be best option for cones, asymmetric astigmatism, etc.

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