Intraobserver reliability of contact pachymetry in children. J AAPOS 2013 Apr;17(2):144-8
Date
04/30/2013Pubmed ID
23622447Pubmed Central ID
PMC3639436DOI
10.1016/j.jaapos.2012.11.005Scopus ID
2-s2.0-84876900959 (requires institutional sign-in at Scopus site) 1 CitationAbstract
BACKGROUND: Central corneal thickness (CCT) is an important measurement in the treatment and management of pediatric glaucoma and potentially of refractive error, but data regarding reliability of CCT measurement in children are limited. The purpose of this study was to evaluate the reliability of CCT measurement with the use of handheld contact pachymetry in children.
METHODS: We conducted a multicenter intraobserver test-retest reliability study of more than 3,400 healthy eyes in children aged from newborn to 17 years by using a handheld contact pachymeter (Pachmate DGH55; DGH Technology Inc, Exton, PA) in 2 clinical settings--with the use of topical anesthesia in the office and with the patient under general anesthesia in a surgical facility.
RESULTS: The overall standard error of measurement, including only measurements with standard deviation ≤5 μm, was 8 μm; the corresponding coefficient of repeatability, or limits within which 95% of test-retest differences fell, was ±22.3 μm. However, standard error of measurement increased as CCT increased, from 6.8 μm for CCT less than 525 μm, to 12.9 μm for CCT 625 μm and greater. The standard error of measurement including measurements with standard deviation >5 μm was 10.5 μm. Age, sex, race/ethnicity group, and examination setting did not influence the magnitude of test-retest differences.
CONCLUSIONS: CCT measurement reliability in children via the Pachmate DGH55 handheld contact pachymeter is similar to that reported for adults. Because thicker CCT measurements are less reliable than thinner measurements, a second measure may be helpful when the first exceeds 575 μm. Reliability is also improved by disregarding measurements with instrument-reported standard deviations >5 μm.
Author List
Weise KK, Kaminski B, Melia M, Repka MX, Bradfield YS, Davitt BV, Johnson DA, Kraker RT, Manny RE, Matta NS, Schloff S, Pediatric Eye Disease Investigator GroupAuthor
Alexander Joseph Khammar MD Associate Professor in the Ophthalmology and Visual Sciences department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AdolescentChild
Child, Preschool
Cohort Studies
Cornea
Corneal Pachymetry
Female
Humans
Infant
Infant, Newborn
Male
Observer Variation
Point-of-Care Systems
Reproducibility of Results
