Premium
Some components affecting the precision of corneal thickness measurement performed by optical pachometry
Author(s) -
Edmund Carsten,
Cour Morten
Publication year - 1986
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1986.tb06961.x
Subject(s) - variance components , variation (astronomy) , variance (accounting) , observer (physics) , slit lamp , coefficient of variation , ophthalmology , mathematics , accuracy and precision , optics , statistics , optometry , physics , medicine , astrophysics , accounting , quantum mechanics , business
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.