title: Some components affecting the precision of corneal thickness measurement performed by optical pachometry.
abstract: With the Haag-Streit pachometer attached to a Haag-Streit 900 slit-lamp, 29 normal individuals were examined by repeated measurements on two separate days by the same observer. A statistical variance component model admitted three components of variance to be separated and estimated as SD: The biological day to day variation (0.006 mm), the variation attributed to the slit-lamp adjustment (0.005 mm), and the variation derived from the adjustment of the pachometer (0.013 mm). Knowing these components an optimum practical procedure of examination can be established.
mesh_terms: D000328:Adult; D000367:Age Factors; D003315:Cornea / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D009885:Ophthalmology / Q000295:instrumentation; D012737:Sex Factors; D013045:Species Specificity