Anatomical Characterization of an Optic Disc Notch Using SD-OCT in Glaucoma.

Abstract:

PURPOSE:To characterize anatomical dimensions of a disc notch using novel methods using spectral domain optical coherence tomography (SD-OCT). PARTICIPANTS:All age- and severity-matched glaucoma patients with disc notch (defined as complete loss of neural rim with no residual rim between disc and cup) seen from 2014 to 2015 who underwent enhanced depth imaging with SD-OCT (Cirrus HD-OCT version 6.5, Carl Zeiss, USA) were included for this retrospective observational study. METHODS:Using known dimensions of the 200 * 200 optic disc cube (6 * 6 mm), the notch width was calculated from the margins of the notch on either side using ImageJ software. The height was calculated from the lowest margin of the cup to the lowest point of the defect on the optic disc. These were compared with the quadrant retinal nerve fiber layer (qRNFT) and sectoral retinal nerve fiber layer (sRNFLT) thickness in notch and the sector 2 clock hours adjacent to the notch region (SaRNFLT). RESULTS:The height and width of the notch in 31 eyes of 27 patients were 2.6 ± 0.48 mm and 2.23 ± 0.31 mm. The RNFL thickness in the same sector as that of the notch was 41 ± 21.06 µm while the adjacent two sectors measured 62 ± 26.5 and 64 ± 26.5 µm on either sides of the sector of the notch. The difference between the sRNFLT and saRNFLT ranged from -9 to 67 and -13 to 50 µm, respectively. This difference was significantly associated with height of the notch (R2 = 20.8, p = 0.01). CONCLUSION:Automated analysis of a notch and RNFL thickness in that sector can help in precise glaucoma monitoring in the region of interest.

journal_name

Semin Ophthalmol

authors

Rao A,Kaza H,Padhy D,Das G,Sarangi S

doi

10.1080/08820538.2018.1540709

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

878-885

issue

7-8

eissn

0882-0538

issn

1744-5205

journal_volume

33

pub_type

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