Patent ID: 7845088

Claim:
A lens shape measuring method comprising the steps of: bringing a feeler into contact with one of an inner peripheral surface of a lens frame and an outer peripheral surface of a spectacle lens or a template, each of the inner peripheral surface and the outer peripheral surface corresponding to a lens shape of spectacles, the feeler being rotatable about a rotation axis and movable forward and backward relative to the rotation axis in a radial direction; and while keeping the contact state, moving the feeler along a contact surface of the feeler with the lens shape in a circumferential direction, to thereby measure radii ρi (i=0, 1, 2, . . . n) of the lens shape over an entire circumference of the lens shape, the radii ρi representing change in distance from a geometric center of the lens shape to the feeler, wherein a measurement region of the lens shape measured by the feeler is divided into a plurality of sub-regions, and within each of the sub-regions, the rotation axis line is moved to a position with which the feeler is capable of measuring the lens shape to thereby cause the feeler to measure the lens shape within the sub-region.