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Wavefront holoscopy: application of digital in-line holography for the inspection of engraved marks in progressive addition lenses
Journal of Biomedical Optics
Progressive addition lenses (PALs) are engraved with permanent marks at standardized locations in order to guarantee correct centering and alignment throughout the manufacturing and mounting processes. Out of the production line, engraved marks provide useful information about the PAL as well as act as locator marks to re-ink again the removable marks. Even though those marks should be visible by simple visual inspection with the naked eye, engraving marks are often faint and weak, obscured bydoi:10.1117/1.jbo.19.1.016017 pmid:24449144 fatcat:re5ea3csubh55ebr6evebb7jxy