A comparison of cup-to-disc ratio evaluation in normal subjects using stereo biomicroscopy and digital imaging of the optic nerve head

The cup‐to‐disc (CD) ratio evaluated using stereoscopic biomicroscopy was compared with that evaluated by viewing a non‐stereo digital image of the optic nerve head. Twenty normal subjects (mean age 26 ± 4 years) were evaluated by two observers. The average CD ratio was 0.29 with a range of 0–0.80....

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Bibliographic Details
Published in:Ophthalmic & physiological optics 2003-01, Vol.23 (1), p.51-59
Main Authors: Hrynchak, Patricia, Hutchings, Natalie, Jones, Deborah, Simpson, Trefford
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
cup-to-disc ratio
digital imaging
fundus biomicroscopy
Fundus Oculi
glaucoma
Glaucoma - diagnosis
Humans
Image Processing, Computer-Assisted
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Observer Variation
Ophthalmology
Optic Disk - anatomy & histology
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
Photogrammetry
reliability
Sensitivity and Specificity
Signal Processing, Computer-Assisted
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Summary:The cup‐to‐disc (CD) ratio evaluated using stereoscopic biomicroscopy was compared with that evaluated by viewing a non‐stereo digital image of the optic nerve head. Twenty normal subjects (mean age 26 ± 4 years) were evaluated by two observers. The average CD ratio was 0.29 with a range of 0–0.80. The intra‐class correlations between the observers ranged from 0.82 to 0.96, when comparing horizontal and vertical CD ratios for both evaluation techniques. The mean CD ratio was significantly smaller when viewing the digital image (0.25 ± 0.01) compared with stereoscopic observation (0.33 ± 0.03, p 
ISSN:0275-5408
1475-1313
DOI:10.1046/j.1475-1313.2003.00088.x