Patent ID: 8386203

Claim:
A method for evaluating a progressive-addition lens comprising: a power distribution measuring step in which powers of the progressive-addition lens at a plurality of points are measured to obtain an actually measured power distribution; a similarity search step in which a comparison power distribution created based on the actually measured power distribution and a defective power distribution are compared with each other to perform a similarity search between the comparison power distribution and the defective power distribution, wherein the defective power distribution is a distribution for which a relative positional shift is generated between one surface and another surface of the progressive-addition lens; and an evaluation step, performed using a processor, in which whether or not the comparison power distribution and the defective power distribution are similar to each other is determined based on the result of the similarity search step, if it is determined that the comparison power distribution and the defective power distribution are similar to each other, then the progressive-addition lens is evaluated as defective, and if it is determined that the comparison power distribution and the defective power distribution are not similar to each other, then the progressive-addition lens is evaluated as not defective.