Evaluation of the Cortical Vitreous Using Swept-Source Optical Coherence Tomography in Normal Eyes

Seung Hun Park; Jung Wook Lee; Min Ji Lee; Ju Hyang Lee; In Seok Song; Byung Ro Lee

doi:10.3341/jkos.2016.57.4.595

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Park, Lee, Lee, Lee, Song, and Lee: Evaluation of the Cortical Vitreous Using Swept-Source Optical Coherence Tomography in Normal Eyes

Original Article

J Korean Ophthalmol Soc 2016;57(4):595-600.

Published online: 3 September 2016

DOI: https://doi.org/10.3341/jkos.2016.57.4.595

Evaluation of the Cortical Vitreous Using Swept-Source Optical Coherence Tomography in Normal Eyes

Seung Hun Park, MD, Jung Wook Lee, MD, Min Ji Lee, MD, Ju Hyang Lee, MD, PhD, In Seok Song, MD, PhD, Byung Ro Lee, MD, PhD

Department of Ophthalmology, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea

Address reprint requests to Byung Ro Lee, MD, PhD Department of Ophthalmology, Hanyang University Hospital, #222-1 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea Tel: 82-2-2290-8570, Fax: 82-2-2291-8517 E-mail: brlee@hanyang.ac.kr

Received 24 September 2015 Revised 29 December 2015 Accepted 9 February 2016

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To observe the shape of posterior vitreous spaces using swept-source optical coherence tomography (SS-OCT) in normal eyes.

Methods

The posterior vitreous of 80 eyes of 80 volunteers without ocular disease was imaged. The DRI OCT-1 Atlantis (Topcon, Oakland, NJ, USA) was used to acquire scans of the posterior vitreous over an 18 × 18-mm² area using the 12-mm horizontal line scan protocol. The size of the premacularis bursa was measured by the aliper function of the OCT.

Results

A boat-shape bursa was found in most cases. The prevalence of detected bursa fell with further increases in the extent of posterior vitreous detachment. The mean width of the bursa premacularis was 7,679.1 µm and the mean depth was 471.4 µm.

Conclusions

Deep range imaging optical coherence tomography will provide improvement for in vivo anatomic characterization of the cortical vitreous, and allow better visualization of the dimensions of the bursa premacularis.

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Keywords: Posterior vitreous, Swept-source optical coherence tomography

References

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Figure 1.

Evaluation of cortical vitreous using SS-OCT. An OCT 12-mm horizontal scan through the fovea in the left eye of a 57-year-old man. To improve visualization, the brightness and contrast were increased. The height of the bursa premacularis is defined as the distance between the fovea and the anterior border, and the width is the maximum diameter in the 12-mm horizontal scan through the fovea and the disc. The white dot indicates the septum between the bursa premacularis and Cloquet's canal. SS-OCT = swept-source optical coherence tomography.

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Figure 2.

Swept-source optical coherence tomography of the cortical vitreous. A horizontal scan through the fovea and the optic disc showed a boat-shaped bursa premacularis (*). In front of the optic disc, the Cloquet's canal (**) was connected to the bursa premacularis.

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Figure 3.

Classification of posterior vitreous detachment (PVD). ‘’ indicates the border of posterior vitreous. (A) No PVD. (B) PVD stage 1. (C) PVD stage 2. (D) PVD stage 3.

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Figure 4.

Correlation of variation in width and depth of the bursa premacularis with patient age. There was no correlation between variation in width and patient age (R² = 0.09; A), and between variation in depth and patient age (R² = 0.03; B).

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Table 1.

Number of eyes and prevalence of the bursa premacularis in the cortical vitreous according to PVD stage

	Eyes		Prevalence of bursa premacularis
	%	No.	%	No.
No PVD	58.75	47	91.5	43/47
PVD stage 1^*	8.75	7	28.6	2/7
PVD stage 2^†	10	8	12.5	1/8
PVD stage 3^‡	5	4	25	1/4
PVD stage 4^§	0	0	−	0
Not gradable	17.5	14	21.4	3/14
Total	100	80	−	50/80

PVD = posterior vitreous detachment.

^* Focal perifoveal PVD, limited to either the temporal or nasal side of the fovea, with persistent attachment to the fovea and optic nerve head;

^† Focal perifoveal PVD, involving both the temporal and nasal side of the fovea, with persistent attachment to the fovea and optic nerve head;

^‡ PVD over the fovea with persistent attachment to the optic nerve head;

^§ Complete PVD over the macula and optic nerve head.

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