METHOD AND SYSTEM FOR AUTOMATICALLY NON-CONTACT MEASURING OPTICAL CHARACTERISTICS OF OPTICAL OBJECT

PROBLEM TO BE SOLVED: To automatically non contact measure optical characteristics of an optical object or particularly an ophthalmological element or the like by comparing an image to be detected of the object by an illumination light emitted through a reference pattern with a reference pattern image without optical object. SOLUTION: Light rays from illuminators 1a to 1b become a plurality of illuminating light beams from ground points of a reference pattern through a diffusing plate 4, and passes an optical object A1. Only the beam passing an incident pupil of a detecting camera 7 of the beams entering in parallel with a focus adjusting optical element 6 forms an image of a reference pattern 3. The image is detected by the camera 7, and recorded. A computer 8 which inputs a recorded image through a frame grabber 9 analyzes a deformation of the reference pattern image by the object A1. That is, a control element (a point, a line or the like) of the pattern 3 is identified. The image value of only the pattern 3 stored in a memory is compared with coordinates, shape measured value of the pattern element, a deformation of the reference pattern image by the object A1 is decided, and optical characteristics are measured.