Optic disc parameters in manifest and suspected glaucoma
DOI:
https://doi.org/10.16964/er.v1i1.47Keywords:
digital fundus photography, optic disc, heidelberg retina tomograph, glaucoma probability score, visual field index.Abstract
Structure and function measurements are important in glaucoma management. Digital fundus photography has become a standard procedure and the Heidelberg Retina Tomograph (HRT), commonly used by glaucoma specialists, provides a glaucoma probability score (GPS). The visual field index (VFI) is a novel statistic, aiming to facilitate follow-up of glaucoma patients. The aim of this study was to compare the results from the digital analysis of fundus photographs with HRT measurements including GPS and VFI in patients with ocular hypertension, suspect glaucoma or glaucoma, and if possible define an optic disc index, useful in glaucoma diagnosis. Fifty-eight consecutive patients from a glaucoma service were included. Optic disc parameters (disc and cup areas) were measured on digital fundus photographs, using a semi-automatic method, and compared with the GPS from the HRT and the VFI from standard automated perimetry. A significant relationship was observed between the GPS group classification (normal, borderline, or abnormal) and VFI classification (normal or abnormal), both when the GPS borderline group was regarded as normal (P = 0.0038 Fisher test) and as abnormal (P=0.0179, kappa = 0.33). No significant relationship was observed between VFI and optic disc parameters. The threedimensional information in the GPS appears to be more related to visual function, as measured by VFI, than the planimetric measures of the optic disc.
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2011-12-01
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An Open Access Publication is one that meets the following two conditions:
1. The author(s) and copyright holder(s) grant(s) to all users a free, irrevocable, worldwide, perpetual right of access to, and a license to copy, use, distribute, transmit and display the work publicly and to make and distribute derivative works, in any digital medium for any responsible purpose, subject to proper attribution of authorship, as well as the right to make small numbers of printed copies for their personal use.
2. A complete version of the work and all supplemental materials, including a copy of the permission as stated above, in a suitable standard electronic format is deposited immediately upon initial publication in at least one online repository that is supported by an academic institution, scholarly society, government agency, or other well-established organization that seeks to enable open access, unrestricted distribution, interoperability, and long-term archiving.
Authors who publish with this journal agree to the following terms: 1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal. 2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal. 3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.
