A high resolution Hartmann-Shack wavefront sensing instrument (Optocraft UHR SHSInspect) can characterise the optical design of a multifocal contact lens by recording more than 6,000 unique measurements over the central 6mm of a contact lens. From the more than 6,000 unique measurements, a profile of how the power changes from the centre of the lens out to the periphery of the optical portion of the lens can be generated. This power profile provides great insight into how the power of multifocal contact lenses changes within the optical zone of the lens and also provides an innovative and powerful method to understand some of the key contributing factors to successfully fitting multifocal contact lenses.
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