| http://www.w3.org/ns/prov#value | - A progressive power lens according to claim 1, wherein said g(r) and h(r) satisfy the following equations (6) and (7): g ??? ( r ) = ??? n ??? G n ??? ( r - r 0 ) n ( 6 ) h ??? ( r ) = ??? n ??? H n ??? ( r - r 0 ) n ( 7 ) where Gn and Hn are coefficients for determining g(r) and h(r), which are constants not depending on r for a certain progressive refractive surface; and n is an integer of 2 or
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