LENS METER

PROBLEM TO BE SOLVED: To provide a lens meter optimized in wide-area measurement and narrow-area measurement respectively. SOLUTION: The lens meter 1 has a first light source 10 for emitting measuring light of a first wavelength, a second light source 11 for emitting measuring light of a second wavelength, a light guide means 14 which guides the measuring light of the first wavelength and the measuring light of the second wavelength so as to have approximately the same axis and can project them to a test lens 4, a first measuring mask 16 which is arranged in the downstream of the test lens 4, allows the measuring light of the first wavelength to pass partially, and allows the measuring light of the second wavelength to pass wholly, and a second measuring mask 17 which is arranged in the downstream of the first measuring mask, allows the measuring light of the first wavelength wholly, and allows the second measuring light partially. COPYRIGHT: (C)2009,JPO&INPIT