Some components affecting the precision of corneal thickness measurement performed by optical pachometry
- 1 October 1986
- journal article
- research article
- Published by Wiley in Acta Ophthalmologica
- Vol. 64 (5) , 499-503
- https://doi.org/10.1111/j.1755-3768.1986.tb06961.x
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.Keywords
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