title: Optical pachometry measurements: reliability and variability.
abstract: Polymethyl methacrylate (PMMA) lenses of known thickness were measured by one investigator with a pachometer. This experienced pachometrist held variation in thickness measurements to within 1% over time. The measurements were repeatable with a SD less than 1%. The data indicate that measured corneal thickness changes should be greater than 1 to 2% to be considered true changes in thickness.
mesh_terms: D002138:Calibration; D003315:Cornea / Q000033:anatomy & histology*; D006801:Humans; D009907:Optometry / Q000295:instrumentation*