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Digital imaging of the optic nerve head: monoscopic and stereoscopic analysis

Morgan, James Edwards ORCID:, Sheen, Nicholas John Leighton, North, Rachel Valerie ORCID:, Choong, Y F and Ansari, E. 2005. Digital imaging of the optic nerve head: monoscopic and stereoscopic analysis. British Journal of Ophthalmology 89 (7) , pp. 879-884. 10.1136/bjo.2004.046169

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Aims: To compare monoscopic and stereoscopic assessment of the optic disc using novel software for the digital stereoscopic analysis of optic disc stereopairs. Methods: Software was developed for the stereoscopic display of digital optic disc images using an interlaced display method. Neuroretinal rim width was determined at 10 degree intervals around the optic disc using a custom (stereoscopic) cursor whose depth was adjusted to that of Elschnig’s rim. Measurements were taken, first viewing the disc monoscopically and at a separate sitting, stereoscopically. Results: Measurements were made in 35 eyes from 35 patients (1260 estimates for each observer) using three observers. The mean cup to disc ratio (CDR) ranged from 0.57 to 0.66 (SD 0.13–0.14) for monoscopic viewing compared with 0.64 to 0.69 (SD 0.12–0.14) for stereoscopic viewing. Stereoscopic assessments gave higher CDRs in temporal, superior, nasal, and inferior aspects of the optic disc (p<0.001, Mann-Whitney U test). Agreement between observers in estimating CDR was high for monoscopic assessment (intraclass correlation coefficient 0.74 (CI 0.72 to 0.76) increasing to 0.80 (0.78 to 0.82) for stereoscopic assessment. Conclusion: Digital stereoscopic optic disc assessment provides lower estimates of neuroretinal rim width and higher levels of interobserver agreement compared with monoscopic assessments.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Optometry and Vision Sciences
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > RE Ophthalmology
Publisher: BMJ Publishing Group
ISSN: 0007-1161
Last Modified: 17 Oct 2022 08:42

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