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At least 145 records · Page 8Linked to original sources

PubMed2002

Vitrectomy for retained lens fragments in the vitreous after phacoemulsification.

PURPOSE: To assess the visual results, retinal detachment (RD) rate, incidence of glaucoma, and intraocular lens (IOL) placement after vitrectomy for removal of retained lens fragments in the vitreous after phacoemulsification. SETTING: Department of Ophthalmology, University Hospital of Lund, Lund, Sweden. METHODS: This retrospective noncomparative interventional case series included all cases of pars plana vitrectomy for removal of retained lens fragments from January 1997 through January 2000. RESULTS: Sixty-six eyes of 65 patients had pars plana vitrectomy with removal of the lens material over the 3-year period. Visual acuity on presentation was 0.1 or worse in 36 eyes (54%). Visual acuity after vitrectomy was 0.5 or better in 35 eyes (53%). The postoperative visual acuity was worse than 0.1 in 14 eyes (21%). Twenty-seven (56%) of the 48 eyes operated on within 1 week and 8 (44%) of the 18 eyes operated on later achieved a visual acuity of 0.5 or better. Twelve eyes (80%) that had secondary posterior chamber IOL implantation achieved an acuity of 0.5 or better. An RD occurred in 7 eyes (11%). CONCLUSIONS: There was no statistically significant difference in outcomes between those having vitrectomy the first few days after cataract surgery and those having it later, although there was a trend toward better results when the vitrectomy was done sooner. Secondary IOL implantation resulted in a good visual outcome. Retinal detachment was the most severe complication.

Adult↗

PubMed2002

Pediatric cataract surgery with or without anterior vitrectomy.

PURPOSE: To evaluate after-cataract formation in children having cataract surgery with or without dry anterior vitrectomy and possible differences according to age. SETTING: St. Erik's Eye Hospital, Stockholm, Sweden. METHODS: This retrospective study comprised 85 eyes of 85 patients from 0 to 15 years old who had cataract surgery with or without anterior vitrectomy after the implantation of an intraocular lens (IOL). All patients had primary posterior capsulorhexis but no optic capture. Thirty-five patients received a heparin-surface-modified poly(methyl methacrylate) IOL (809C, Pharmacia & Upjohn) and 50 patients, a foldable acrylic IOL (AcrySof(R), Alcon). The records from follow-up visits at the patients' home clinics were used for analysis. RESULTS: Significantly fewer children were operated on for after-cataract if they had cataract surgery with anterior vitrectomy (P <.05). This applied to both IOL types. In the children older than 7 years in the AcrySof IOL group, there was no difference in the frequency of after-cataract surgery (P >.05). CONCLUSION: In children younger than 7 years with an AcrySof IOL, the rate of after-cataract surgery was significantly less in those who had an anterior vitrectomy at the time of cataract surgery (P <.05). In younger children, it is advantageous to perform cataract surgery with anterior vitrectomy to help prevent after-cataract formation; however, vitrectomy is not necessary in older children.

Acrylic Resins↗

PubMed1996

Combined endocapsular phacoemulsification, pars plana vitrectomy, and intraocular lens implantation.

OBJECTIVE: To determine whether a combined vitrectomy and phacoemulsification is a safe and feasible approach in patients requiring a vitrectomy who have a concomitant significant lens opacity. SETTING: Royal Victoria Eye and Ear Hospital, Dublin, Ireland. METHODS: This retrospective study comprised five patients with significant lens opacities who had combined trans pars plana vitrectomy and phacoemulsification with intraocular lens implantation. Main outcome measures were visual acuity and intraoperative and postoperative complications. RESULTS: The combined surgical approach resulted in minimal complications, and postoperative visual acuity was satisfactory. CONCLUSION: In the hands of experienced phacoemulsification and vitrectomy surgeons, combined trans pars plana vitrectomy and phacoemulsification can be a safe approach in treating patients requiring a vitrectomy who have significant lens opacities precluding a view of the posterior segment.

Adult↗

PubMed1999

Phacoemulsification in eyes with past pars plana vitrectomy: case-control study.

PURPOSE: To determine intraoperative and postoperative complications and outcomes of phacoemulsification of cataract in eyes that had previous pars plana vitrectomy. SETTING: University-based anterior segment disease referral practice. METHODS: This was a retrospective case-control study of a surgical series of 52 consecutive postvitrectomy cataract extractions statistically compared with control eyes from the same practice. RESULTS: Cataract extraction followed vitrectomy by 2 months to 6 years (mean 19 months). Cataracts with a posterior subcapsular component were seen more frequently in postvitrectomy eyes (58% versus 25% in control eyes). Cataract extraction after pars plana vitrectomy was often more challenging than in control eyes. Challenges included unstable posterior capsules, loose zonules, and posterior capsule plaque. Postoperative posterior capsule opacification (PCO) was more common in study than in control eyes (51% versus 21%; P = .002), especially if expandable gas or silicone oil had been used at vitrectomy. Visual acuity improved in 87% of study eyes, with 46% achieving a visual acuity of 20/40 or better. In study eyes in which the indication for vitrectomy was macular hole or epiretinal membrane, nuclear sclerosis was the most common cataract type, no intraoperative complications occurred, the PCO rate was low (13%), and visual acuity was better (73% 20/40 or better) than in the other study eyes. CONCLUSION: Phacoemulsification after pars plana vitrectomy can be performed with a low complication rate and with good visual results, although limited by underlying retinal disease. Posterior capsule opacification requiring neodymium: YAG capsulotomy was common in this series.

Adolescent↗

PubMed2001

Planned two-step vitrectomy for extremely large and thick subretinal hematoma.

PURPOSE: To describe a new surgical strategy, planned two-step vitrectomy, for a large and thick subretinal hematoma involving 3 or more quadrants of the fundus. SURGICAL METHODS: In a first-step vitrectomy, a retinotomy was made in the posterior pole, after any vitreous hemorrhage had been removed. Following fluid-gas exchange with no laser photocoagulation around the retinotomy, patients took a face-down position for a few days to a week to facilitate subretinal hemorrhage movement to the vitreous cavity and anterior chamber. In a second-step surgery, the hemorrhage in the vitreous cavity and anterior chamber was washed out. The remaining subretinal hemorrhage was aspirated, and the retina was reattached with fluid-gas exchange and laser photocoagulation around the retinotomy. RESULTS: The planned two-step vitrectomy was performed in 4 consecutive patients with large and thick subretinal hematomas involving 3 or more quadrants seen during a 3-year period. By a face-down position after the first-step vitrectomy, subretinal hemorrhage moved to the vitreous cavity and anterior chamber. The remaining subretinal hemorrhage in a smaller quantity could be easily removed, leading to retinal reattachment in the second-step surgery. CONCLUSIONS: The planned two-step vitrectomy is a safer and more effective procedure for removing a large quantity of subretinal hemorrhage in a shorter period of surgical time, compared with hemorrhage removal in a single vitrectomy.

Aged↗

PubMed2002

Outcome of vitrectomy in patients with Terson syndrome.

PURPOSE: To report findings and evaluate the results of vitrectomy in 22 eyes with Terson syndrome. METHODS: We reviewed retrospectively the records of patients who underwent pars plana vitrectomy as a result of vitreous haemorrhage. Twelve cases concerned unilateral vitrectomy and five concerned bilateral vitrectomy. The time interval between intracranial haemorrhage and vitrectomy was 1-10 months (mean 5.9 months). RESULTS: During a mean follow-up of 23.3 months (range 1-69 months) visual acuity (VA) improved in 21 of 22 eyes. Preoperative VA was < or = 0.1 in 20 of 22 eyes, while postoperative VA was > or = 0.5 in 16 of 21 eyes. Poor visual outcomes were mainly caused by retinal detachments (seven eyes, in which three were caused by proliferative vitreoretinopathy), epiretinal membranes (seven eyes) and optic atrophy (one eye). Our study concurs with recent reports suggesting early vitrectomy in bilateral cases and in cases where ultrasonography shows epiretinal membrane or proliferative retinopathy formation.

Adult↗

PubMed2006

Scleral buckling combined with vitrectomy for the management of rhegmatogenous retinal detachment associated with inferior retinal breaks.

AIM: The use of adjunctive scleral buckling during vitrectomy for retinal detachment associated with inferior breaks has been the recent focus of some debate. It has been suggested that any benefit might be outweighed by potential complications associated with buckling surgery. The purpose of this study was to compare the success rate of vitrectomy, gas, and supplementary scleral buckling with the results of two recently published case series suggesting that acceptable results in inferior break detachments can be achieved with vitrectomy and gas alone. METHODS: A retrospective analysis of 60 consecutive patients with inferior break retinal detachments was conducted. All patients underwent vitrectomy, gas, and scleral buckling. In all cases, fellow eyes were examined under anaesthesia for retinal breaks if posterior vitreous detachment (PVD) had occurred at the time of presentation. Demographics, preoperative, and postoperative complications and outcome were recorded. RESULTS: Primary retinal attachment at 3 months was achieved in 95% of patients. This exceeds success rates of published data of patients who underwent vitrectomy and gas without buckling (81-89%). In patients with PVD in the fellow eye, 53% had horseshoe tears and all were treated with cryopexy. No sight-threatening complications occurred, but five patients developed minor buckle-related complications postoperatively. CONCLUSION: Supplementary scleral buckling is a safe procedure that improves and enhances primary success rates in inferior break detachments over vitrectomy and gas without buckling. There is a high rate of PVD-related breaks requiring treatment in the fellow eyes.

Female↗

PubMed2001

[Therapy of radiation resistant malignant uveal melanoma with endoresection by pars plana vitrectomy in two patients].

BACKGROUND: Since introduction of brachytherapy using (106)ruthenium plaque therapy for treating malignant choroidal melanomas a number of comparative studies have shown that survival rates are equal between patients who underwent radiation or enucleation. When radiation treatment fails, the patient might be determined to choose removal of the tumor by pars plana vitrectomy. PATIENTS AND METHODS: Between 1995 and 1998 a total number of 48 patients underwent (106)ruthenium plaque irradiation. In 9 patients tumor regression was not sufficient. Two of these nine patients decided explicitly against enucleation and choose to have the tumor removed from within the eye employing pars plana vitrectomy. RESULTS: Intraoperatively, the previously radiated melanoma was easily removed with the vitrectomy cutter without significant bleeding. Postoperative recovery was without complications. Silicone oil removal was carried out in one patient after one year. Vision 9 months and 2.5 years after surgery was 0.2 and 0.02, respectively. The cosmetic results with parallel axis of the globes were very good and one patient gained binocular vision. No recurrent tumor growth was seen so far. Histologically, no mitotic figures were found. CONCLUSION: Malignant choroidal melanomas can be safely removed by pars plana vitrectomy with stable intraocular pressure. Previous radiation therapy alters the tumor, inducing fibrous tissue growth and necrosis of tumor cells. These tissue types are not prone to bleed when they are resected by the vitrectomy cutter. Long time studies have to elucidate the difference in survival rates between patients undergoing enucleation of the eye and patients who chose endoresection of the melanoma by pars plana vitrectomy.

Adult↗

PubMed1984

[Vitrectomy in uveitis].

Between January 1976 and December 1983, at the First University Eye Clinic in Vienna, 568 vitrectomies and 287 lensectomies were carried out; in 69 of these interventions (20 lensectomies and 49 vitrectomies) the diagnosis was uveitis. In 24 cases the indication for vitrectomy was an intermediary uveitis, a post-traumatic uveitis in 4 and a sympathetic uveitis in 6 cases as well as suppurative endophthalmitis in 7 patients. Indications for surgical removal of pathological tissue from the anterior chamber by the use of vitrectomy instrumentation were, in 4 cases each, hypopioniritis and a hemorrhagic uveitis, and in 12 cases a phacogenic uveitis. In about two thirds of this very heterogeneous patient material, employing vitrectomy made it possible to achieve regression of uveitis. In the remaining third of the patients, at least a stationary state of the disease was achieved and a reduction of corticosteroid and immunosuppressive therapy were made possible. The best functional results were achieved in all surgical interventions in the anterior ocular segment and in vitrectomies for intermediary uveitis. In suppurative endophthalmitis, however, these results were unfavorable.

Humans↗

PubMed2001

Sympathetic ophthalmia associated with pars plana vitrectomy without antecedent penetrating trauma.

PURPOSE: To evaluate, describe, and categorize the clinical presentation, clinical course, histopathology, and response to therapy in patients without a history of penetrating ocular trauma who developed sympathetic ophthalmia following pars plana vitrectomy. METHODS: The records of patients without a history of trauma who underwent pars plana vitrectomy and developed sympathetic ophthalmia were retrospectively reviewed. Cases were analyzed with respect to clinical presentation, fluorescein angiographic findings, anatomic and visual outcomes, histopathology, and response to therapy. RESULTS: Eight eyes were identified. The median age at presentation was 55 years, with a range of 14 to 62 years. The time from vitrectomy to diagnosis of sympathetic ophthalmia ranged from 2 months to greater than 2 years, with a median of 7 months. Six of eight patients (75%) presented with anterior chamber reaction. All eight patients presented with a vitreous inflammatory response. The optic nerve was inflamed clinically or angiographically in four of eight cases (50%). Small yellow-white sub-retinal pigment epithelial deposits were present in four of eight cases (50%). Two eyes had lesions characterized as multifocal choroiditis. One eye had larger yellow placoid-like lesions. One eye presented with vitritis but no retinal lesions. Subretinal choroidal neovascularization was noted in the inciting eye of one patient. Vision improved in the sympathizing eye with immunosuppressive therapy in five of eight cases (62.5%). CONCLUSIONS: Sympathetic ophthalmia can be seen following pars plana vitrectomy in patients without penetrating injuries or a history of trauma. Indeed, it may be seen after successful vitrectomy for retinal detachment. Diverse clinical presentations are possible, and persistent or atypical uveitis following vitrectomy should alert the surgeon to the development of sympathetic ophthalmia.

Adolescent↗

PubMed2003

Ocular blood flow parameters after pars plana vitrectomy in patients with diabetic retinopathy.

BACKGROUND: Whereas the anatomic result of vitrectomy in patients with vitreoretinal complications due to diabetes is usually satisfying, the functional outcome is sometimes poor. The authors investigated whether this may be related in part to effects of vitrectomy on ocular perfusion. METHODS: Ocular hemodynamics were measured before vitrectomy and 1 and 4 weeks postoperatively in 13 consecutive diabetic patients. Pulsatile choroidal blood flow was assessed with laser interferometric measurement of fundus pulsation amplitude. In addition, mean blood flow velocity and resistive index in the ophthalmic artery, the central retinal artery, and the posterior ciliary arteries were measured with color Doppler imaging. RESULTS: Fundus pulsation amplitude was significantly reduced after surgery as compared to baseline (baseline: 3.7 +/- 1.0 microm; 4 weeks: 3.1 +/- 0.8; P < 0.001). Postoperatively, mean blood flow velocity in the central retinal artery (P = 0.009) and the posterior ciliary arteries (P = 0.0006) was significantly reduced, whereas resistive index was increased in the central retinal artery (P = 0.028) but not in the posterior ciliary arteries. CONCLUSIONS: The current data suggest that vitrectomy induces significant reductions in ocular blood flow in patients with diabetic retinopathy. Whether this may affect the visual outcome after vitrectomy or whether this reflects improved retinal oxygenation after vitrectomy remains to be established.

Adult↗

PubMed2004

Visual outcomes and complications after multiple vitrectomies for diabetic vitreous hemorrhage.

PURPOSE: To determine the visual outcomes and complications after multiple vitrectomies for repeat diabetic vitreous hemorrhage. METHODS: A retrospective review during a 4-year period of patients requiring multiple vitrectomies for nonclearing vitreous hemorrhages with at least a 6-month follow-up. RESULTS: Of the 38 cases of multiple vitrectomies for diabetic vitreous hemorrhage, the initial visual acuity was 20/50 or better in 5%, between 20/60 and 20/400 in 37%, and worse than 20/400 in 58%. The final visual acuity after the last vitrectomy was 20/50 or better in 25%, between 20/60 and 20/400 in 47%, and worse than 20/400 in 28%. Patients had a mean improvement of 1.08 lines of visual acuity, and a statistically significant difference in logMAR visual acuity was noted when the last corrected visual acuity was compared with baseline acuity by way of paired t-testing. Although a trend toward visual improvement was noted in patients who underwent multiple vitrectomies, multivariate models failed to detect any association between number of surgeries or demographic variables and change in visual acuity. CONCLUSION: Multiple vitrectomies for recurrent diabetic vitreous hemorrhage can have a favorable anatomic outcome while maintaining ambulatory vision.

Diabetic Retinopathy↗

PubMed2007

25-gauge vs 20-gauge system for pars plana vitrectomy: a prospective randomised clinical trial.

AIM: To compare 25-gauge vs 20-gauge system for pars plana vitrectomy in a prospective, randomised, controlled clinical trial. METHODS: Three-port pars plana vitrectomy was performed in 60 patients belonging to 2 groups. Evaluations were performed preoperatively, intraoperatively, during the first three postoperative days, at 1 week, and at 1 and 3 months. The main outcome measure was time for surgery, divided into duration of wound opening, vitrectomy, retinal manipulation and wound closure. RESULTS: The total duration of surgery showed no significant difference between the groups (p = 0.67). The 25-gauge group showed significantly shorter duration of wound opening (p<0.001) and wound closure (p<0.001). In contrast, the vitrectomy duration was significantly longer in the 25-gauge group (p<0.001). Conjunctival injection and subjective postoperative pain showed significantly lower irritation in the 25-gauge group (p<0.001 for both). CONCLUSION: The 25-gauge vitrectomy system offered significantly improved patient comfort during the first postoperative week. The smaller surgical openings facilitated wound healing and minimised pain. Duration of surgery was comparable between the two systems-the shorter time needed for wound opening and closure in the 25-gauge group being equalised by the longer vitrectomy duration. Intraoperative as well as retinal manipulation and illumination caused more surgical difficulties using the 25-gauge system.

Epiretinal Membrane↗

PubMedDate not supplied

Re-worsening factor after successful vitrectomy for diabetic retinopathy: optic disc fibrovascular proliferation and macular disease.

PURPOSE: To investigate the factors that influence the visual-changing pattern in proliferative diabetic retinopathy even after successful vitrectomy. METHODS: One hundred and forty-seven consecutive eyes were retrospectively reviewed for 6-48 (average 20) months, and were divided into the following 4 groups based on their changing pattern of vision: group A, the visual acuity improved postoperatively and maintained the maximal corrected vision throughout the observation period (n = 49); group B, the visual acuity improved postoperatively but deteriorated thereafter (n = 68); group C, the visual acuity remained the same as before operation (n = 17), and group D, the visual acuity deteriorated immediately after vitrectomy (n = 13). Various issues including systemic conditions, blood tests, preoperative ocular findings, the operative procedures and postoperative complications were reviewed based on the patient records. These issues were analyzed by Spearman's rank correlation, chi(2) test, an analysis of variance (ANOVA) and the Kruskal-Wallis test. Finally, the discriminate factors between groups A and B were examined by a stepwise logistic regression analysis. RESULTS: The following tendencies were observed in all 4 groups: younger patients tended to show a better visual-changing pattern (p = 0.02); patients with younger age at diabetes onset had a better visual-changing pattern after vitrectomy (p = 0.001), and a lower hemoglobin (Hb) A1c level is associated with a better visual changing pattern (p = 0.017). Preoperative rubeosis and macular detachment were frequently found in groups C and D, as well as postoperative rubeosis, vitreous bleeding and retinal detachment. Finally, a stepwise logistic regression analysis showed both fibrovascular proliferation (p = 0.016) from the optic disc and postoperative macular disease (p = 0.0009) to be significant factors for differentiating group A from group B. CONCLUSIONS: In addition to the factors which have already been indicated to affect the visual outcome of a vitrectomy, preoperative findings such as optic disc fibrovascular proliferation and postoperative macular disease were found to affect the visual-changing pattern after a successful vitrectomy. The optimal timing of surgery is very important not only in order to obtain good visual acuity but also to maintain good vision even after a successful vitrectomy.

Adult↗

PubMed2003

Intravitreal triamcinolone acetonide as an additional tool in pars plana vitrectomy for proliferative diabetic retinopathy.

PURPOSE: To evaluate the safety and efficacy of intravitreal injections of crystalline triamcinolone acetonide as an adjunctive procedure in pars plana vitrectomy for proliferative diabetic retinopathy. METHODS: This nonrandomized comparative study included 30 patients (32 eyes) who underwent standardized pars plana vitrectomy for treatment of proliferative diabetic retinopathy and who received an intravitreal injection of 25 mg triamcinolone acetonide at the end of surgery. Mean follow-up time was 5.60 +/- 5.14 months. The study group was compared with a control group (32 eyes) matched with the study group for preoperative and intraoperative parameters and who underwent pars plana vitrectomy for proliferative diabetic retinopathy without intravitreal injection of triamcinolone acetonide. RESULTS: The study group and the control group did not vary significantly in frequency of postoperative retinal detachment, re-pars plana vitrectomy, or postoperative enucleation or phthisis bulbi, or in best postoperative visual acuity, visual acuity at end of the study, or gain in visual acuity. CONCLUSIONS: In this pilot study, the study group with pars plana vitrectomy and intravitreal triamcinolone acetonide injection compared with the nonrandomized control group without intravitreal triamcinolone acetonide injection did not show a higher than usual rate of postoperative complications. As a corollary, however, the data do not suggest the adjunct use of 25 mg intravitreal triamcinolone acetonide combined with pars plana vitrectomy as treatment of proliferative diabetic retinopathy.

Adult↗

PubMed1995

The role of vitrectomy in rhegmatogenous retinal detachment.

Several conditions, such as detachment from posterior breaks or detachment with significant media opacities, may warrant vitrectomy as the primary procedure. In cases in which the preoperative retinal view is clear and a posterior break is definitively excluded, vitrectomy does not appear to offer significant advantage over scleral buckling other than a theoretically improved ability to examine the retina microscopically with scleral depression. Performing a vitrectomy for an uncomplicated retinal detachment from a small peripheral break in which scleral buckling would be the usual procedure of choice remains controversial. Although it may avoid the complications of scleral buckling, vitrectomy does have its own potential complications. The status of the lens, cornea, and configuration of the retinal tears and detachment should carefully be considered before vitrectomy. Proper patient selection and appropriate education are important factors in a successful outcome. Finally, from an economic viewpoint, the likelihood of success with vitrectomy in one procedure compared with other less expensive procedures should be considered.

Humans↗

PubMed2000

[Place of "exploratory vitrectomy" in the treatment of retinal detachment without proliferative vitreoretinopathy].

INTRODUCTION: One of the principal causes that may contribute to failure in the treatment of retinal detachment without PVR is the inability to detect the retinal break before and during surgery. We propose in these cases the use of exploratory primary vitrectomy allowing the location and the treatment of the retinal break. MATERIAL AND METHODS: We have studied retrospectively 19 cases of retinal detachment without any preoperatively identified break. In 14 cases, it was a pseudophakic detachment (the IOL was in the posterior chamber with an optic between 5 and 6 mm), in 5 cases it was a phakic detachment. Peripheral fundus was examined with the vitrectomy probes with and without perfluorocarbon liquid injection. Cryotherapy or endophotocoagulations have been used to create a chorio-retinal adhesion and a gaz tamponade was used without scleral buckling procedure. RESULT: In 2 cases, no retinal break was found. In the other cases, the retinal tear has been identified during basal vitrectomy in 8 cases, during injection of perfluorocarbon in 2 cases and during the vitrectomy done forward the PFLC in 7 cases. The retinal break was identified as a small retinal tear along the posterior margin of the vitreous base in 15 cases (several in 2 cases) and as atrophic hole in 2 cases. DISCUSSION: Exploratory vitrectomy is an interesting technique to identify a retinal break when a scleral indentation cannot offer a good visualization of the anterior retina or retinal tears. In young phakic patients, a primary vitrectomy may be dangerous but seems to be justified in pseudophakic eyes. The research of the tear is sometimes facilitated by a peroperative tamponade of the retro equatorial retina.

Aged↗

PubMed2001

Cataract formation after pars plana vitrectomy.

To investigate the duration and pattern of cataract formation after pars plana vitrectomy, thirty-three eyes from 33 patients with complete data from March 1995 to January 2000 were collected in this study. The time and pattern of cataract formation was analyzed according to Lens Opacities Classification System III (LOCS III). The correlation between the mean cataract progression and follow-up time was determined by simple regression and correlation analysis. Diabetes mellitus and hypertension were the main causes of patients with vitreoretinopathy who underwent pars plana vitrectomy procedure. Twenty-one patients (63.6%) had diabetes mellitus and 11 patients (33.3%) had hypertension. Four eyes (13.8%) received intravitreal gas injection after pars plana vitrectomy. The correlation between cataract progression and follow-up time was clinically significant (p < 0.05). Thirty-one patients (94%) were nuclear cataract, the mean time of cataract formation being 9.1 months; 15 patients (46.9%) were cortical cataract, the mean time of formation being 8 months; and 24 patients (72.7%) were posterior subcapsular cataract, the mean time of formation being 13.3 months. Cataract formation after pars plana vitrectomy is not infrequent. Nuclear cataract is the most common type in this study. Vitreous microenvironmental changes, post-vitrectomy uveitis, intravitreal gas, and patient age may be the key points of cataract formation after surgery. The mechanism of longer-term effect of pars plana vitrectomy on lens status is still unknown and merits further study.

Adult↗