Comparison of postoperative anterior segment changes associated with pars plana vitrectomy with and without vitreous base shaving

Toklu, Enes; Altınışık, Muhammed; Elbay, Ahmet; Koytak, Arif

doi:10.18240/ijo.2020.11.10

Cited by 8 publications

(6 citation statements)

References 33 publications

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“…Regarding the vitrectomy, in a study by Khodabande et al [8], there were no changes in ACD, AOD, TISA, or TIA after vitrectomy. However, in a study by Toklu et al [26], postoperative ACD was reduced in cases of complete vitrectomy with scleral indentation. They suggests that the presence of the anterior vitreous can affect ACD after vitrectomy.…”

Section: Discussionmentioning

confidence: 91%

Changes in Intraocular Pressure and Anterior Chamber Parameters Following Cataract Surgery, Vitrectomy, and Combined Surgery

Kim,

Park,

Lee

2024

Korean J Ophthalmol

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Purpose: The aim of this study is to investigate changes in intraocular pressure (IOP) and anterior-segment parameters before and after cataract surgery, vitrectomy, and combined surgery.Methods: The records of patients who had undergone cataract surgery (cataract group), vitrectomy (vitrectomy group), or combined cataract surgery and vitrectomy (combined group) at our hospital were retrospectively examined. The vitrectomy group consisted of pseudophakic eyes. IOP and anterior-segment measurements, including anterior chamber depth (ACD), angle opening distance (AOD), trabecular-iris angle (TIA), and trabecular-iris space area (TISA), were measured using swept-source anterior-segment optical coherence tomography before and 6 months after surgery in 41, 15, and 40 eyes, respectively.Results: In the cataract and combined groups, there was a decrease in IOP (cataract group: from 15.8 to 13.4 mmHg, p <0.001; combined group: from 15.8 to 14.2 mmHg, p = 0.002) and an increase in the central corneal thickness after surgery (p <0.001). The ACD increased in all groups, with a smaller increase in the vitrectomy group (p <0.03). Postoperative AOD, TIA, and TISA were significantly increased in the cataract and combined groups (p <0.02). Higher preoperative IOP and larger IOP reduction after surgery were correlated with smaller preoperative AOD, TISA, and TIA in cataract and combined groups (p <0.034). A small preoperative ACD was related to smaller preoperative AOD, TISA, TIA (r > 0.649, p <0.001), and postoperative IOP reduction in the cataract and combined groups (r = 0.377, p = 0.018 and r = 0.559, p = 0.001, respectively).Conclusions: Compared to the vitrectomy group, the cataract and combined groups showed reduced postoperative IOP and increased AOD, TISA, and TIA. In these two groups, patients with shallower preoperative ACDs showed greater changes in IOP after surgery. Changes in IOP after surgery are thought to be related to changes in the anterior segment caused by the removal of the crystalline lens.

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Section: Discussionmentioning

confidence: 91%

Changes in Intraocular Pressure and Anterior Chamber Parameters Following Cataract Surgery, Vitrectomy, and Combined Surgery

Kim,

Park,

Lee

2024

Korean J Ophthalmol

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“…[ 12 ] Indeed, these variations might be due to the different imaging modalities in addition to inter or intra-observer biases. In addition, Toklu et al revealed that not removing the vitreous base with scleral indentation in PPV surgeries (partial PPV) in contrast to complete PPV, may create a more stable anterior chamber and prevent the reduction in ACD [ 19 ].…”

Section: Discussionmentioning

confidence: 99%

Changes in anterior segment optical coherence tomography following pars plana vitrectomy without tamponade

et al. 2021

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Background To evaluate changes in anterior segment morphology on anterior segment optical coherence tomography (AS-OCT) following pars plana vitrectomy (PPV) without tamponade. Methods Patients who underwent PPV without tamponade for epiretinal membrane were evaluated. Eligible patients underwent intraocular pressure (IOP) measurement and AS-OCT preoperatively as well as 1 month and 6 months post-operatively. Anterior chamber width (ACW), anterior chamber depth (ACD), trabecular iris angle (TIA), angle opening distance at 500 and 750 µm (AOD), and trabecular iris space area at 500 and 750 µm (TISA) at four quadrants were recorded and analyzed. Additionally, the mean values of TIA (MTIA), AOD (MAOD), and TISA (MTISA) for each eye (mean of four quadrants) were analyzed. Results 23 patients completed the study. The mean age of participants was 56.4 ± 3.6 years of age and 13/23 (56%) were female. Mean IOP of patients was 18.1 ± 1.1, 18.3 ± 1.1, and 18.1 ± 1.2 preoperatively,1 month post-operatively, and 6 months post-operatively, respectively. (p = 0.83). No difference was detected post-operatively in measurements of ACW, ACD, MTIA, MAOD500, MAOD750, MTISA500, and MTISA750. Conclusion Pars plana vitrectomy without tamponade was not associated with changes in anterior chamber morphology.

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“…Enes Toklu et al. 46 reported that compared with patients who underwent the partial pars plana vitrectomy, those who underwent the complete pars plana vitrectomy (with vitreous base shaving) had a significantly deeper anterior chamber. Considering the anatomical proximity of the vitreous base to the zonules, the zonules may play an important role in the pathogenesis of glaucoma by altering the depth of the anterior chamber, and the role of vitreous zonules in the glaucoma pathogenesis may be greater than that of other zonules.…”

Section: Zonular Abnormality and Angle Closure Glaucomamentioning

confidence: 99%

Research progress of lens zonules

Pan

Liu

Zhang

2023

Advances in Ophthalmology Practice and Research

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Comparison of postoperative anterior segment changes associated with pars plana vitrectomy with and without vitreous base shaving

Cited by 8 publications

References 33 publications

Changes in Intraocular Pressure and Anterior Chamber Parameters Following Cataract Surgery, Vitrectomy, and Combined Surgery

Changes in Intraocular Pressure and Anterior Chamber Parameters Following Cataract Surgery, Vitrectomy, and Combined Surgery

Changes in anterior segment optical coherence tomography following pars plana vitrectomy without tamponade

Research progress of lens zonules

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