Optical EngineeringMeasuring ophthalmologic surfaces by means of moire deflectometry
|Format||Member Price||Non-Member Price|
A new technique for measuring ophthalmologic surfaces such as aspheric contact lenses and the human cornea is proposed in this paper. The method is based on the principle of moire´ deflectometry. In moire´ deflectometry, two fringe patterns (deflectograms) are generated, each providing a piece of information about the measured wavefront. Compared with interferometric techniques, interpretation of the fringe patterns obtained is more difficult. Therefore synthetic deflectograms for surfaces with known parameters are generated. Computer simulation of deflectograms in the case of aberrations introduced by an aspherical object is also performed. Experimental results for various curved surfaces, including contact lenses and the human cornea, are demonstrated.