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      Changes in Retinal Vessel and Retinal Layer Thickness After Vitrectomy in Retinal Detachment via Swept-Source OCT Angiography

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          Abstract

          Purpose

          To compare postvitrectomy retinal and choroidal vessel density (VD) and retinal layer thickness between eyes with macula-off and macula-on rhegmatogenous retinal detachment (RRD) using swept-source optical coherence tomography (SS-OCT) and optical coherence tomography angiography (OCTA) and to identify OCTA factors associated with visual outcomes.

          Methods

          We retrospectively reviewed 31 eyes that underwent pars plana vitrectomy for primary RRD. Eyes with macula-off and macula-on RRD were compared with healthy fellow eyes. Both OCT and OCTA were performed 6 months after surgery, and the macula-off RRD group was divided into two subgroups according to the presence of an outer retinal defect. The correlations between postoperative best-corrected visual acuity (BCVA) at 6 months and SS-OCT and OCTA measurements were analyzed.

          Results

          Twenty eyes with macula-off RRD and 11 eyes with macula-on RRD were included. In the macula-off RRD group, the central retinal thickness was significantly decreased 6 months postoperatively compared with the fellow eyes (228.9 ± 29.7 µm and 253.6 ± 27.7 µm, P = 0.009). In the outer retinal defect group, the choriocapillaris plexus (CCP) VD was significantly decreased compared with the fellow eyes (56.4% ± 4.8% and 60.2% ± 4.0%, P = 0.026). In the macula-off RRD group, the postoperative BCVA at 6 months correlated significantly with the ratio of the center CCP VD of the detached eyes to that of the fellow eyes ( R 2 = 0.207, P = 0.025).

          Conclusions

          The CCP VD could be related to the anatomical restoration of the outer retinal layer in macula-off RRD. The CCP VD as determined by OCTA could be an indicator of the visual outcome after surgery in macula-off RRD.

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          Most cited references26

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          Improvements on Littmann's method of determining the size of retinal features by fundus photography.

          A G Bennett, A R Rudnicka, D F Edgar (1994)
          Littmann's formula relating the size of a retinal feature to its measured image size on a telecentric fundus camera film is widely used. It requires only the corneal radius, ametropia, and Littmann's factor q obtained from nomograms or tables. These procedures are here computerized for practitioners' convenience. Basic optical principles are discussed, showing q to be a constant fraction of the theoretical ocular dimension k', the distance from the eye's second principal point to the retina. If the eye's axial length is known, three new methods of determining q become available: (a) simply reducing the axial length by a constant 1.82 mm; (b) constructing a personalized schematic eye, given additional data; (c) ray tracing through this eye to extend calculations to peripheral retinal areas. Results of all these evaluations for 12 subjects of known ocular dimensions are presented for comparison. Method (a), the simplest, is arguably the most reliable. It shows good agreement with Littmann's supplementary procedure when the eye's axial length is known.
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            OCT-angiography: A qualitative and quantitative comparison of 4 OCT-A devices

            Marion Munk, Helena Giannakaki-Zimmermann, Lieselotte Berger … (2017)
            Purpose To compare the quality of four OCT-angiography(OCT-A) modules. Method The retina of nineteen healthy volunteers were scanned with four OCT-devices (Topcon DRI-OCT Triton Swept-source OCT, Optovue RTVue-XR, a prototype Spectralis OCT2, Heidelberg-Engineering and Zeiss Cirrus 5000-HD-OCT). The device-software generated en-face OCT-A images of the superficial (SCP) and deep capillary plexuses (DCP) were evaluated and scored by 3 independent retinal imaging experts. The SCP vessel density was assessed using Angiotool-software. After the inter-grader reliability assessment, a consensus grading was performed and the modules were ranked based on their scoring. Results There was no significant difference in the vessel density among the modules (Zeiss 48.7±4%, Optovue 47.9±3%, Topcon 48.3±2%, Heidelberg 46.5±4%, p = 0.2). The numbers of discernible vessel-bifurcations differed significantly on each module (Zeiss 2±0.9 bifurcations, Optovue 2.5±1.2, Topcon 1.3±0.7 and Heidelberg 0.5±0.6, p≤0.001). The ranking of each module differed depending on the evaluated parameter. In the overall ranking, the Zeiss module was superior and in 90% better than the median (Bonferroni corrected p-value = 0.04). Optovue was better than the median in 60%, Topcon in 40% and Heidelberg module in 10%, however these differences were not statistically significant. Conclusion Each of the four evaluated OCT-A modules had particular strengths, which differentiated it from their competitors.
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              FACTORS ASSOCIATED WITH VISUAL OUTCOME AFTER MACULA-OFF RHEGMATOGENOUS RETINAL DETACHMENT SURGERY.

              Dae Hyun Park, Kyung Seek Choi, Hae Sun … (2018)
              To evaluate preoperative factors influencing the visual outcome and postoperative factors associated with the changes in visual acuity, after reattachment surgery to treat macula-off rhegmatogenous retinal detachment.
              Article 0 comments Cited 45 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Invest Ophthalmol Vis Sci
                Journal ID (iso-abbrev): Invest. Ophthalmol. Vis. Sci
                Journal ID (hwp): iovs
                Journal ID (pmc): iovs
                Journal ID (publisher-id): IOVS
                Title: Investigative Ophthalmology & Visual Science
                Publisher: The Association for Research in Vision and Ophthalmology
                ISSN (Print): 0146-0404
                ISSN (Electronic): 1552-5783
                Publication date (Electronic, pub): 21 February 2020
                Publication date (Print, pub): February 2020
                Volume: 61
                Issue: 2
                Electronic Location Identifier: 35
                Affiliations
                [1] Department of Ophthalmology, Hanyang University College of Medicine , Seoul, Korea
                Author notes
                Correspondence: Yong Un Shin, Department of Ophthalmology, Hanyang University College of Medicine , Seoul 04763, Korea; syu2000@ 123456hanmail.net .
                Mincheol Seong, Department of Ophthalmology , Hanyang University College of Medicine , Seoul 04763, Korea; goddns76@ 123456hanmail.net

                EHH and HC contributed equally to this work.

                Article
                Publisher ID: IOVS-19-27352
                DOI: 10.1167/iovs.61.2.35
                PMC ID: 7326598
                PubMed ID: 32084264
                SO-VID: 4611bf4e-8d6e-4f9c-99b9-e060bf124a80
                Copyright © Copyright 2020 The Authors
                License:

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                Date accepted : 03 December 2019
                Date received : 19 April 2019
                Page count
                Pages: 10
                Categories
                Subject: Retina

                Keywords: rhegmatogenous retinal detachment,optical coherence tomography angiography,retinal vessel density,swept-source optical coherence tomography
                Data availability:
                Keywords: rhegmatogenous retinal detachment, optical coherence tomography angiography, retinal vessel density, swept-source optical coherence tomography

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