A lens having one or more toroidal surfaces. A toroidal surface is one having a maximum power in one meridian and a minimum power in a perpendicular meridian. In ophthalmic optics, toric lenses are used to correct astigmatism. At Optikos, our system in SMI Surface Measurement Instrument measures toric lenses. For more information, click on the image below.
SMI Surface Measurement Instrument
