Abstract：
OBJECTIVE:To evaluate the reproducibility of optical coherence tomograph (OCT) retinal nerve fiber layer (RNFL) measurements in normal and glaucomatous eyes by means of the commercially available OCT 2000 instrument (Humphrey Systems, Dublin, CA). DESIGN:Prospective instrument validation study. PARTICIPANTS:One eye each from 10 normal subjects and 10 glaucoma patients. METHODS:Twenty subjects underwent a total of eight scanning sessions during two independent visits. In each session, five circular scans centered on the optic nerve head were performed. The first two sessions were performed by two experienced technicians. Followed by a 30-minute break, a third and a fourth session was completed by the same technicians. This sequence was duplicated on a second visit. Intrasession, intersession, intervisit, and interoperator reproducibility of quadrant and global RNFL measurements were calculated by use of a components of variance model. MAIN OUTCOME MEASURES:RNFL thickness. RESULTS:The coefficient of variation for the mean RNFL thickness was significantly smaller (P = 0.02) in normal eyes (6.9%) than in glaucoma eyes (11.8%). The estimated root mean squared error based on the statistical model using three scans per patient was 5.8 and 8.0 micrometer for normal and glaucoma eyes, respectively. A components of variance model showed most of the variance (79%) to be due to differences between patients. Only a modest contribution to variability was found for session (1%), visit (5%), and operator (2%). CONCLUSION:With the commercially available OCT, our results indicate that the RNFL measurements are reproducible for both normal and glaucomatous eyes.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Blumenthal EZ,Williams JM,Weinreb RN,Girkin CA,Berry CC,Zangwill LMdoi
10.1016/s0161-6420(00)00341-9subject
Has Abstractpub_date
2000-12-01 00:00:00pages
2278-82issue
12eissn
0161-6420issn
1549-4713pii
S0161642000003419journal_volume
107pub_type
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