What primary attribute does a bitoric lens design offer?

A bitoric lens design is specifically engineered to address astigmatism, which is caused by an irregular shape of the cornea that leads to different refractive powers in different meridians of the eye. The primary attribute of a bitoric lens is its ability to correct this refractive error by having two toroidal surfaces, each designed to provide the necessary optical power in two different meridians. This allows the lens to compensate for the uneven curvature of the cornea, effectively improving vision for individuals with astigmatism.

The other potential attributes, while they may be features of different lens designs or concepts, do not adequately define the primary purpose of a bitoric lens. It is the bitoric design's targeted correction of astigmatism that makes it a unique and essential option in optical solutions.