31 兩個圓柱透鏡其屈光力各為+1.00DC×090，+3.00DC×180，密接組合後新球柱透鏡等效屈光力為多少？
(A)+1.00DS/-2.00DC×090
(B)+1.00DS/+2.00DC×180
(C)+1.00DS/-1.00DC×180
(D)+3.00DS /+2.00DC×090

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統計： A(31), B(152), C(17), D(18), E(0) #1642377