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.