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Figure 17: p values for conic sections used in sag determination By employing conicoid curves, aspheric lenses have imaging properties very close to point focal (figure 18) with the added benefit of a ...

There are many examples of both finite and infinite non-Desarguesian planes. Some of the known examples of infinite non-Desarguesian planes include: Regarding finite non-Desarguesian planes, every ...

Higher-order aspherical surfaces can be obtained by deforming a conicoid to obtain a surface which flexes back on itself at larger diameters (Figure 7). Such surfaces are known as polynomial surfaces.