Wave Custom Settings Feature
Custom Settings takes Wave design to the next level of personal design philosophy. The Wave user enters and saves sets of design definition parameters as templates that Wave fits (as closely as possible) on the eight design semi meridians. Definitions for differing corneal sizes, lens modalities, high/medium/low myopic ortho k, hyperopic ortho k are all possible. Users can easily share definitions.Customizing Auto Designs
The “Custom Settings” screen appears under [Auto Design] [Auto Design Custom Settings].
When this screen first appears, the drop down list under “Select Definition” points to “Default Settings”. At this point, any variable can be changed. After a variable is changed, the text below “Current Definition” changes to “Edited Settings” and the background of the text box is changed to green. In the example below, the design mode was changed from Tangential to Axial:
If the user clicks [Continue] this screen will disappear and the Wave work window will become active as it automatically attempts to satisfy the values chosen on the Custom Settings screen.
After calculating the lens, the [AutoDesign] [Custom Settings] can be chosen again and this screen will re-appear with the previous changes preserved. In this way, the user can move back and forth between the Wave work window and the Custom Settings screen and make minor adjustments to the settings to test the effect on the lens design.
The “Default Settings” definition functions in a different way than user defined Custom Settings Definitions. The purpose of the “Default Settings” selection is to aid in the design of lenses that have a rotationally symmetrical spherical optic zone regardless of design mode.
Each time the user clicks [AutoDesign][Custom Settings] the Wave application analyzes the source topography and calculates two of the variables selected on the Custom Settings screen.
1. Target Lens Power
The value of the “Target Lens Power” variable is determined by empirical calculation. The software measures the flattest semi-meridian in the source topography. This value is then subtracted from the average K measurement, and the result is added to the spherical equivalent refractive error.
Average K – Flattest K + Spherical equivalent Refractive Error = Target Lens Power.
For example, if the average K is 44.00, and the Flattest K is 43.00 and the spherical equivalent refractive error is –3.00, the “Target Lens Power” variable will be set to
–2.00. If however, the spherical equivalent refractive error is +2.00, the results of the same calculation will set the “Target Lens Power” to +3.00.
The primary method recommended to adjust the tear layer thickness within the optic zone of the resultant lens design created using the “Default Settings” calculation is by adjusting the “Target Lens Power” variable.
2. Lens Design Mode
The lens design mode is determined based on the results of two calculations. The software calculates the amount of astigmatism present in the source topography. If there is less than 1.50D of corneal astigmatism, the program designates the design mode as RSYM.
If there is greater than 1.50D of corneal astigmatism, the software calculates the amount of asymmetry in each of the four primary meridians at a chord diameter of 10.00 mm. If the maximum amount of asymmetry in any meridian is less than 100, or more than 545 microns, the program designates the design mode as GSYM.
If the asymmetry in any meridian is between 100 and 545 microns, the design mode is designated as FFORM.