|The term base curve is used to describe a curvature with the same radius of curvature of the front surface of lenses with different refractive powers.|
In the traditional base curve system for progressive lenses one design is always optimized for a group of powers, with semi-finished lenses being prefabricated accordingly. Their number is limited, e.g. the same semi-finished lens is used for +3.00 D as for +4.00 cyl 1.00.
The Gradal IndividualŪ and GradalŪ Short I individualized progressive lenses, however, are computed and produced separately for each individual prescription. The number of possible design variants is unlimited. Every wearer receives a design optimized for his or her own personal requirements.
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