title: Inspection of freeform intraocular lens topography by phase measuring deflectometric methods.
abstract: Manufacturing spherical, aspheric, and freeform surfaces requires testing throughout the development and production process. State-of-the-art topography measurement is limited in applicability for intraocular lenses (IOLs), and there is no dedicated commercial surface measurement system available for freeform IOLs. The purpose of this work was to validate a deflectometric setup for surface measurement, detection of defects, and shape fidelity analysis for the development and production of IOLs. The setup is based on a phase measuring deflectometer with a field-of-view of 80 mm×80 mm and a mean repetition accuracy of 1.6·10(-3) D. The technique is suitable for detection of global and local surface errors, extracted from geometry and topography analysis. For validation according to DIN ISO 5725:2002, spherical IOLs with radii of curvature of 10 and 20 mm, a commercial aspheric IOL, and single-sided freeform IOL samples were used.
authors.affiliation: Experimental Ophthalmology, Saarland University, Homburg/Saar, Germany. alexis.speck@uks.eu
authors.forename: Alexis
authors.initials: A
authors.lastname: Speck
authors.forename: Benedikt
authors.initials: B
authors.lastname: Zelzer
authors.forename: Marc
authors.initials: M
authors.lastname: Kannengießer
authors.forename: Achim
authors.initials: A
authors.lastname: Langenbucher
authors.forename: Timo
authors.initials: T
authors.lastname: Eppig
mesh_terms: D000042:Absorption; D002386:Cataract / Q000628:therapy; D004867:Equipment Design; D006801:Humans; D019654:Lens Implantation, Intraocular / Q000295:instrumentation*; D007910:Lenses, Intraocular; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012031:Refractometry; D015203:Reproducibility of Results; D012984:Software; D013499:Surface Properties
chemical_list: D019904:Polymethyl Methacrylate