Br J Ophthalmol 2000;84:403-407
( April )
A new digital optic disc stereo camera: intraobserver and
interobserver repeatability of optic disc measurements
G N Shuttleworth, C H Khong, J P Diamond
Bristol Eye
Hospital, Lower Maudlin Street, Bristol BS1 2LX
Correspondence to: Dr Shuttleworth
Accepted for publication 8 December 1999
AIMS To investigate
the intraobserver and interobserver repeatability of optic disc
measurement using a new digital optic disc stereo camera.
METHODS112
consecutive new patients presenting to a glaucoma service had dilated
optic disc photography performed using a new digital stereo camera
(Discam, Marcher Enterprises Ltd, Hereford). The images were
analysed by two masked observers using a stereo viewer and computer
simulated stereopsis. Vertical and horizontal cup:disc ratios (CDR),
cup area:disc area, and cup circumference:disc circumference were
computed. Intraobserver and interobserver repeatability analyses were
performed. Intraclass correlation coefficients (ICC) and 95% tolerance
for change (TC) were computed.
RESULTS220 optic
discs were photographed, of which 196 were suitable for analysis (10 were of poor image quality and 14 had anomalous discs). Mean age of
patients was 65 years, 60 were male and 48 female. For intraobserver
measurements of: horizontal CDR, ICC = 0.94, TC = 0.11 (15% of range);
vertical CDR, ICC = 0.92, TC = 0.14 (16% of range); cup area:disc
area, ICC = 0.95, TC = 0.10 (13% of range), and cup circumference:disc
circumference, ICC = 0.95, TC = 0.09 (14% of range). For interobserver
measurements of: horizontal CDR, ICC = 0.89, TC = 0.14 (19% of range);
vertical CDR, ICC = 0.90, TC = 0.14 (16% of range); cup area:disc
area, ICC = 0.92, TC = 0.13 (16% of range), and cup circumference:disc circumference, ICC = 0.90, TC = 0.12 (17% of range). Systematic bias
between observers was within acceptable limits.
CONCLUSIONSDigital
stereo disc photography and analysis provide repeatable measures of
optic disc variables. The results compare favourably with
ophthalmoscopic and stereophotographic methods of assessment of the
optic disc.
© 2000 by British Journal of Ophthalmology
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