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This paper presents a digital interferometric method to demodulate Placidofringe patterns. This method uses a computer-stored conic-wavefront asreference carrier. Even though, Placido mires are widely used in cornealtopographers. This is not however a paper on corneal topography and/or itsclinical use. This paper focuses on the theoretical aspects to phase-demodulatePlacido mires using synchronous interferometric techniques. Placido patternsmay also be applied to test optical wavefronts using a Placido-Hartmann opaqueplate with periodic annular apertures. This test is sensitive to the radialslope of the measuring wavefront. Another wavefront testing approach may use aPlacido-Hartmann-Shack screen with a periodic array of toroidal lenslets. Thisperiodic screen is sensitive to the wavefront's radial-slope at the focal planeof the lenslets. In brief, digital interferometric methods are herein appliedfor the first time to demodulate conic-carrier Placido images. (Patent pendingat the USPTO).

Synchronous phase-demodulation of concentric-rings Placido mires in corneal topography and wavefront aberrometry (theoretical considerations)