To provide an apparatus for evaluating an aspheric lens for enabling the evaluation of the eccentricity or the like between the surfaces of a lens without adding large alteration to an article to be measured and receiving the effect of the position and posture accuracy of a fixture.
The apparatus for evaluating the aspheric lens is equipped with first and second positioning means for dashing the article to be measured against a reference surface with which the reference surface of the article to be measured is brought into contact and a holding means for holding the article to be measured and further equipped with a fixture capable of holding the article to be measured in postures of two ways rotated around the axis crossing the reference surface at a right angle by 180°, a shape measuring means for outputting the surface shape of the article to be measured as the sequence-of- points data of coordinates, first and second positioning means, and an arithmetic means for calculating the eccentricity between the surfaces of the lens of the article to be measured and the thickness of the lens from the shape measuring results of the first and second lens surfaces of the article to be measured.