scholarly journals Pars Plana Vitrectomy and the Risk of Ocular Hypertension and Glaucoma: Where Are We?

2020 ◽  
Vol 9 (12) ◽  
pp. 3994
Author(s):  
Tommaso Rossi ◽  
Guido Ripandelli
Keyword(s):  
Anterior Chamber ◽  
Ocular Hypertension ◽  
Oxygen Tension ◽  
Pars Plana Vitrectomy ◽  
Open Angle Glaucoma ◽  
Crystalline Lens ◽  
Cataract Extraction ◽  
Oxygen Scavenger ◽  
Clinical Series ◽  
Pars Plana

Purpose is to review the pathogenic mechanism for ocular hypertension and glaucoma development after pars plana vitrectomy. Both acute and chronic causes are considered, and special attention is paid to the theories and clinical evidence on the risk of developing Open Angle Glaucoma (OAG) after Pars Plana Vitrectomy (PPV). Most existing scientific literature on the issue agree on the role of ascorbate as an oxygen scavenger within the vitreous chamber. Oxygen tension in the vitreous and anterior chamber is maximum inn proximity of the retinal surface and endothelium, respectively and steeply decreases toward the lens, on both sides, and trabecular meshwork. Vitreous removal and, to a lesser extent, liquefaction, greatly reduces oxygen tension gradient in vitreous chamber while cataract extraction has similar effects on anterior chamber oxygen gradients. Oxygen derivatives originated from the cornea and retina are actively reduced by the vitreous gel and/or the crystalline lens. Vitreous removal and cataract extraction reduce drastically this function. Most reported clinical series confirm this hypothesis although protocol difference and follow-up length greatly impact the reliability of results.

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

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Alireza Khodabande ◽  
Massood Mohammadi ◽  
Hamid Riazi-Esfahani ◽  
Shahab Karami ◽  
Massood Mirghorbani ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Pars Plana Vitrectomy ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Optical Coherence ◽  
Mean Values ◽  
Iop Measurement ◽  
Pars Plana ◽  
The Mean

Abstract 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.

scholarly journals Visual outcome and complications of cataract extraction after pars plana vitrectomy

2018 ◽  
Vol Volume 12 ◽  
pp. 989-994 ◽  
Author(s):  
Amanda Rey ◽  
Ignasi Jürgens ◽  
Xavier Maseras ◽  
Agnieszka Dyrda ◽  
Patricia Pera ◽  
...  
Keyword(s):  
Pars Plana Vitrectomy ◽  
Visual Outcome ◽  
Cataract Extraction ◽  
Pars Plana

Unusual presentation of a choroidal melanoma

2021 ◽  
Vol 14 (5) ◽  
pp. e240983
Author(s):  
Sunila Jain ◽  
Kar Yen Phoong
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Pars Plana Vitrectomy ◽  
Visual Loss ◽  
Spindle Cell ◽  
Choroidal Melanoma ◽  
Artificial Eye ◽  
History Of ◽  
Pars Plana ◽  
Eye Clinic

A 49-year-old gentleman presented with a 1-day history of painful deterioration of vision in his right eye. He was lifting heavy weights just before this visual loss. On examination, his vision was perception of light in that eye, with a medically uncontrollable high intraocular pressure and hyphaema almost completely filling his anterior chamber. An ultrasound performed suggested a working diagnosis of a Valsalva related ‘eight ball’ bleed. After an anterior chamber washout, he had another episode of bleeding three days later. A pars plana vitrectomy was performed and the sample obtained was sent off to the laboratory, revealing a choroidal melanoma. Following enucleation, the histology confirmed a large necrotic spindle cell melanoma, with a haemorrhagic background. Fortunately, no liver metastasis was found. Since his diagnosis 3 years ago, he continues to be followed up in an artificial eye clinic and has regular liver scans under the care of his oncologist.

scholarly journals The occurrence of delayed ocular hypertension and glaucoma after pars plana vitrectomy for rhegmatogenous retinal detachment

2016 ◽  
Vol 94 (6) ◽  
pp. e525-e527 ◽  
Author(s):  
Domagoj Ivastinovic ◽  
William E. Smiddy ◽  
Werner Wackernagel ◽  
Stefan Palkovits ◽  
Jurica Predović ◽  
...  
Keyword(s):  
Retinal Detachment ◽  
Ocular Hypertension ◽  
Pars Plana Vitrectomy ◽  
Rhegmatogenous Retinal Detachment ◽  
Pars Plana

Incidence and Risk Factors of Ocular Hypertension following Pars Plana Vitrectomy and Silicone Oil Injection

2018 ◽  
Vol 240 (3) ◽  
pp. 129-134 ◽  
Author(s):  
Elyse Jabbour ◽  
Georges Azar ◽  
Joelle Antoun ◽  
Hampig Raphael Kourie ◽  
Youssef Abdelmassih ◽  
...  
Keyword(s):  
Risk Factors ◽  
Ocular Hypertension ◽  
Pars Plana Vitrectomy ◽  
Silicone Oil ◽  
Pars Plana ◽  
Oil Injection

Intra-lenticular caterpillar seta in ophthalmia nodosa

2019 ◽  
pp. 112067211985889
Author(s):  
Arshi Singh ◽  
Umesh Chandra Behera ◽  
Hitesh Agrawal
Keyword(s):  
Clinical Examination ◽  
Pars Plana Vitrectomy ◽  
Complete Resolution ◽  
Clinical Course ◽  
Crystalline Lens ◽  
Posterior Uveitis ◽  
Lens Extraction ◽  
Close Observation ◽  
Pars Plana ◽  
Ophthalmia Nodosa

Purpose: To report the clinical course of ophthalmia nodosa with a retained lenticular seta misdiagnosed and treated as non-infectious posterior uveitis for 7 consecutive years. Methods: Meticulous clinical examination led to discovery of the caterpillar seta embedded in the crystalline lens and the intravitreal setae. Results: Lens-sparing pars plana vitrectomy and removal of free-floating vitreal seta resulted in complete resolution of vitritis and uveitis. Conclusion: Embedded seta within a clear lens may remain sequestered, and may be left untouched under close observation, precluding a clear lens extraction in such patients.

scholarly journals Selective Laser Trabeculoplasty for Glaucoma Secondary to Emulsified Silicone Oil after Pars Plana Vitrectomy: A Pilot Study

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Zeynep Alkin ◽  
Banu Satana ◽  
Abdullah Ozkaya ◽  
Berna Basarir ◽  
Cigdem Altan ◽  
...  
Keyword(s):  
Pars Plana Vitrectomy ◽  
Silicone Oil ◽  
Open Angle Glaucoma ◽  
Case Series ◽  
Open Angle ◽  
Selective Laser Trabeculoplasty ◽  
Consecutive Case ◽  
Laser Trabeculoplasty ◽  
Pars Plana ◽  
The Mean

Background. To investigate the efficacy of selective laser trabeculoplasty (SLT) for lowering intraocular pressure (IOP) in patients with open angle glaucoma (OAG) secondary to emulsified silicone oil (SO).Methodology/Principal Findings. Prospective, interventional, consecutive case series of 11 eyes with sustained elevation of IOP after SO removal. The mean IOP at baseline, week 1, month 1, month 3, and month 6 was evaluated. The mean baseline IOP was significantly decreased from 25 ± 2.7 mmHg to 18.4 ± 5.5 mmHg at week 1(P=0.01), 17.9 ± 3.1 mmHg at month 1(P=0.008), 15.8 ± 3.9 mmHg at month 3(P=0.003), and 16.2 ± 4.7 mmHg at month 6(P=0.004). IOP < 21 mmHg was achieved in 91% of the eyes without a significant complication at month 6.Conclusion/Significance. SLT may be successful for lowering IOP in patients with OAG secondary to emulsified SO which was not controlled with maximum antiglaucomatous medical treatment.

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