Ranked-Segment Distribution Curve for Interpretation of Optic Nerve Topography

Asawaphureekorn, Somkiat; Zangwill, Linda M.; Weinreb, Robert N.

doi:10.1097/00061198-199604000-00002

Cited by 43 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ranked segment analysis was introduced in 1996 to improve diagnostic precision and to allow a better classification of different types of glaucoma (Bartz-Schmidt et al 1996;Asawaphureekorn et al 1996). The display format was intended to simplify intuitive interpretation of optic nerve head examinations.…”

Section: Discussionmentioning

confidence: 99%

“…Cumulative normalised rim/disc area ratio curves, were introduced to facilitate discrimination between physiological, focal, and diffuse disc changes after correction for disc size (Bartz-Schmidt et al 1996;Asawaphureekorn et al 1996). The cumulative normalised rim/disc area ratio curve is now implemented in the latest software (version 2.01) for the Heidelberg Retina Tomograph (HRT) (Heidelberg Engineering, Heidelberg, Germany) and labelled ranked segment analysis (RSA).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Comparison of ranked segment analysis (RSA) and cup to disc ratio in computer‐assisted optic disc evaluation

Gundersen

Åsman

2000

Acta Ophthalmologica Scandinavica

View full text Add to dashboard Cite

ABSTRACT.Purpose: Ranked segment analysis is a new method for evaluation of optic nerve head topography with the Heidelberg Retina Tomograph. This analysis ranks sector measurements around the optic disc and compares these measurements with rank specific significance limits. We evaluated the diagnostic precision of the ranked segment analysis in a large clinical sample and compared with vertical cup/disc ratio measurements. Vertical cup/disc ratio measurements were not corrected for disc size. Methods: We analysed optic disc images from 153 normal and 75 glaucomatous eyes using the Heidelberg Retina Tomograph (software version 2.01). Ranked segment analyses and vertical cup/disc ratio measurements were obtained from each optic disc image, and ROC curves were plotted. Results: At the 95% specificity level, sensitivity was significantly lower for ranked segment analysis (70%) compared to vertical cup/disc ratio measurements (85%). Almost 30% of the discs in the glaucoma group were classified as normal using the ranked segment analysis. Discussion: Ranked segment analysis yielded unacceptably poor discrimination, in fact, worse than cup/disc ratio with its known clinical limitations. Glaucomatous disc damage typically occurs at the vertical poles of the disc. High rank measurements (low sector values) in normal eyes, on the other hand, are more common in the temporal disc sectors. Important spatial information is lost during the ranking procedure. This may partly explain the low sensitivity of the ranked segment analysis observed in our study. The results raise serious concerns regarding the clinical usefulness of ranked segment analysis.Key words: ranked segment analysis -glaucoma diagnosis -diagnostic precision -optic nerve head -image analysis -sensitivity and specificity.

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Comparison of ranked segment analysis (RSA) and cup to disc ratio in computer‐assisted optic disc evaluation

Gundersen

Åsman

2000

Acta Ophthalmologica Scandinavica

View full text Add to dashboard Cite

show abstract

“…Average papillary RNFL height is highest in the superior and inferior portions of the disk, creating a ''double hump'' pattern on OCT that can be preserved even in the setting of diffuse nerve fiber degeneration [4]. The temporal sector, corresponding to the papillomacular bundle, is also relatively thick throughout the disease course and accounts for preserved central vision until late-stage disease [3].…”

Section: Limitation Of Side-by-side Photographic Analysis and Opticalmentioning

confidence: 99%

Detection of Glaucoma Progression with Alternation Flicker

Syed

Marlow

Radcliffe

2014

Curr Ophthalmol Rep

View full text Add to dashboard Cite

Glaucoma is a progressive optic neuropathy characterized by functional visual loss and underlying optic nerve deterioration. Optic nerve imaging, achieved using photography and scanning ophthalmic laser diagnostic imaging techniques, is an important aspect of glaucoma diagnosis and management. Alternation flicker is a technique in which serial optic nerve photographs, typically taken one or more years apart, are aligned and alternated in order to allow the observer to easily detect change over time. Alternation flicker has been shown to improve several aspects of optic nerve evaluation and has been demonstrated to correlate with traditional glaucoma risk factors, with some limitations. In this review, we consider the literature with respect to flicker for the evaluation and monitoring of glaucomatous optic neuropathy.

show abstract

“…These instruments offer reasonably reliable measurements of the three-dimensional shape of the ONH which could be used clinically, alongside traditional bi-dimensional parameters such as rim area, disc area, rim/disc area ratio and cup/disc ratio [1,2,9,17]. Based on the ability of these computerised systems to provide the position of a large number of points on the surface of the optic disc, the purpose of this study was to determine the ability of a three-dimensional algorithm -the third moment or cup shape measure (CSM), already used in confocal scanning laser ophthalmoscopes, such as the Heidelberg Retina Tomograph (HRT) -to differentiate ONHs with a normal visual field from those with an abnormal visual field, even when a simultaneous stereoscopic system was used.…”

Section: Introductionmentioning

confidence: 99%