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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.