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Results for “Vitrectomy”

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At least 379 records · Page 21Linked to original sources

PubMed2002

[Implantation of stage II anterior chamber intraocular lens in aphakic eye after vitrectomy].

OBJECTIVE: To sum up the clinical methods and results of stage II anterior chamber intraocular lens (AC-IOL) implantation in 54 aphakic eyes after vitrectomy. METHODS: Traditional corneoscleral limbal and tunnel incision were respectively used to perform stage II AC-IOL implantation separately in 54 aphakic eyes following vitrectomy. RESULT: All 54 eyes had obtained good visual acuity and reached the corrected visual acuity before operation. The naked visual acuity of 11 eyes was >/= 1.0, and the corrected visual acuity of 16 eyes, >/= 1.0. CONCLUSIONS: Two methods of implantation of AC-IOL in aphakic eye after vitrectomy all obtain good results. Tunnel incision can make the surgery process easier and induce corneal astigmatism smaller. The bracket function of vitreous body after vitrectomy disappears. This technique can maintain IOP very well during the operation and make the operation safer.

Adolescent↗

PubMed2001

[Vitrectomy and photocoagulation for treatment of proliferative diabetic retinopathy].

PURPOSE: To evaluate the efficacy of vitreous surgery and photocoagulation for treatment of a series of patients with proliferative diabetic retinopathy(PDR). METHODS: A consecutive series of PDR treated with vitrectomy and photocoagulation during February 1997 to May 2000 was retrospectively analyzed. RESULTS: The series included 79 cases (38 male and 41 female) and 104 eyes [oculus dexter(OD), 26; oculus sinister(OS), 28; oculus uterque(OU), 25] with diabetic history for 0.5-37 (8.5 +/- 6.5) years and eye symptoms for 15 days to 1.5 years (1.5 +/- 1.5 years). Retinal photocoagulation was performed in 30 eyes with only once in 26 eyes before vitrectomy. Surgical techniques included standard vitrectomy, neovascular membrane peeling and fragmentation, endo--diathermy and endolaser. Silicone oil was injected in 59 eyes with active bleeding, retinal detachment, or severe ischemia. Cataract extraction was done in 63 eyes, of which 27 eyes with intraocular lens implantation. Visual acuity was light perception(LP), hand movement(HM), count fingers(CF), and > or = 0.02 in 15, 38, 22, and 29 eyes, respectively before operation. Visual improvement achieved in 84 eyes (80.8%) with > or = 0.1 in 41 eyes (39.4%). Visual acuity remained unchanged or decreased in 20 eyes (20.2%). Neovascular glaucoma occurred in two eyes after surgery. CONCLUSIONS: Although the series of patients with PDR without sufficient retinal photocoagulation before operation, vitrectomy and endolaser improved the visual outcome in the majority of eyes. Silicone oil injected in eyes with severe ischemia, active bleeding or retinal detachment may provide chance for prompt laser coagulation after surgery in order to prevent progression of PDR.

Adult↗

PubMed2000

[Vitrectomy combined with intraocular lens implantation for 103 selected cases of complicated ocular trauma].

PURPOSE: To observe the visual outcome of vitrectomy combined with intraocular lens (IOL) implantation in one operation for patients with complicated ocular trauma. METHODS: Clinical records were retrospectively reviewed in 103 patients with complicated ocular trauma (104 eyes) who underwent vitrectomy combined with IOL implantation in one operation. RESULTS: The series of cases included 35 patients with intraocular foreign body (IOFB), 37 with penetrating injury, 9 (10 eyes) with explosive injury but without IOFB, and 22 with blunt trauma. Preoperatively, visual acuity was no-light-perception to counting fingers in 88 eyes (87.1%) of 100 patients (101 eyes). Visual acuity improved in 94 eyes (93.1%) including 74 eyes (73.3%) with 0.1-1.5 postoperatively. Retinal detachment occurred in one eye during follow-up and cured with pars plana vitrectomy. CONCLUSION: Vitrectomy combined with IOL implantation in one operation can be a safe, fast and effective approach for visual recovery in selected patients with complicated ocular trauma.

Adolescent↗

PubMed1998

[Vitrectomy for the treatment of retinal detachment uncomplicated by advanced proliferative vistreoretinopathy].

PURPOSE: To determine the role of vitrectomy be used in retinal detachment uncomplicated by proliferative vitreoretinopathy (PVR). METHODS: We studied 54 cases who had undergone vitrectomy for retinal detachment uncomplicated by severe proliferative vitreoretinopathy. The indications for vitrectomy fell into three main groups: 1) retineal detachment of PVR-B (n = 15), 2) Retinal breaks at the posterior of PVR-C1 or C2 (n = 11), 3) retinal view was poor (n = 28). RESULTS: The success rate with one procedure was 74% and with further surgery retinal reattachment was achieved in 96%. After surgery, the visual acuity was improved in 43 eyes (79.6%) unchanged in 9 eyes (16.7%), and worse in 2 eyes (3.7%). CONCLUSION: Vitrectomy is an effective method for treatment of selected cases of retinal detachment uncomplicated by proliferative vitreoretinopathy.

Adolescent↗

PubMedDate not supplied

Usefulness of pars plana vitrectomy in managing asymptomatic eyes of Eales' disease.

BACKGROUND: Eales disease is an idiopathic obliterative vasculopathy that commonly affects the peripheral retina of healthy young males characterized by recurrent vitreous haemorrhage. We did this study to evaluate the usefulness of Pars Plana vitrectomy in asymptomatic eyes of patients presenting with Eales' Disease. METHODS: Fifty-five patients with Eales' Disease demonstrable on the basis of three mirror fundus exam and Florescein Fundus Angiography with vitreous hemorrhage underwent either Pan retinal photocoagulation or vitrectomy in a span of 3 years. Their fellow asymptomatic eyes were initially treated with laser photocoagulation and after being followed for six months, they were grouped into either progressive cases (Group A) comprising of eleven eyes that underwent early vitrectomy, or non-progressive cases (Group B) comprising forty-four eyes that did not undergo any further treatment. These cases were followed for at least three years (range 38-42 months). RESULTS: Out of the eleven eyes of group A, seven (63.63%) showed regression of disease process as compared to only ten out of forty-four eyes (22.72%) in Group-B. CONCLUSION: Early vitrectomy in established cases of Eales' disease provides satisfactory results and helps in preventing complications, which are difficult to treat. Regular checkup of peripheral retina by triple mirror examination should be performed in all asymptomatic fellow eyes of Eales disease to detect the disease process at an early stage and prevent further complications.

Adolescent↗

PubMed2003

A comparative study of panretinal photocoagulation and vitrectomy for advanced diabetic retinopathy.

A retrospective, cohort study of patients with diabetic retinopathy was conducted, which assessed factors of age at the time of initial panretinal photocoagulation, sex, race [American Indian and non-Indian), and those requiring postpanretinal photocoagulation vitrectomy. Frequency analyses were used to categorize the study population by ethnicity and sex. Independent sample Student's t test were used to compare means of age, ethnicity, and sex. Layered chi2 analyses were performed to study the ethnic status of the men and women requiring vitrectomy, followed by an examination of the relationship of these three factors to the vitrectomy group using a logistic regression model. Within this 265 patient group, the American Indian male was noted to require vitrectomy more frequently and tended to receive initial panretinal phototcoagulation at a lower age.

Age Distribution↗

PubMed1992

[Is vitrectomy cataractogenic? Study of changes of the crystalline lens after surgery of retinal detachment].

In order to assess the relationships between vitrectomy and postoperative crystalline lens changes we reviewed the records of 298 selected cases of operated retinal detachments in phakic eyes. We compared two groups: 155 eyes were operated with cryotherapy, vitrectomy and gas injection. 143 eyes received cryotherapy and retro-hyaloid fluid-gas exchange. Follow-up of at least 12 months and detailed description of the lens were available in 90 cases and 82 cases of the two groups respectively. Postoperative lens changes were as follows: nuclear sclerosis occurred in 63% of the vitrectomised eyes, mild in 14%, moderate in 16%, severe in 32%. In contrast, nuclear sclerosis occurred in only 4% of the non vitrectomised eyes, all these cases were noted as moderate. Posterior subcapsular opacities occurred in 4.5% of the vitrectomised eyes versus 2.4% of the non vitrectomised eyes. Nuclear sclerotic changes were correlated with vitrectomy and longer follow-up. Posterior subcapsular cataract was correlated with vitrectomy and larger intraocular gas bubble.

Adult↗

PubMed1992

[Postoperative anterior chamber inflammation after posterior chamber intraocular lens implantation concurrent with pars plana vitrectomy and lensectomy].

The authors compared postoperative anterior chamber inflammation of triple procedure; diabetic pars plana vitrectomy, lensectomy with anterior capsule left intact and posterior chamber intraocular lens implantation anterior to anterior capsule, to those of various cataract surgeries with posterior chamber intraocular lens implantation and vitrectomies in diabetic retinopathy eyes. The inflammation was evaluated in terms of the incidence of inflammatory complications (fibrin reaction and posterior synechia of iris), and by periodical measurement of flare counts for postoperative 6 months using a laser flare-cell meter. The inflammation was more intense than those after the following 3 surgeries; phacoemulsification and in the bag intraocular lens implantation after continuous curvilinear capsulorhexis, extracapsular extraction and in the bag intraocular lens implantation after can opener capsulotomy, and vitrectomy alone. The inflammation, however, was less intense compared with that of another method of triple procedure; pars plana vitrectomy, phacoemulsification and in the bag intraocular lens implantation after continuous curvilinear capsulorhexis or can opener capsulotomy, and development of posterior synechia was rarely observed.

Adult↗

PubMed2003

[Vitrectomy for endophthalmitis after cataract surgery].

PURPOSE: To identify risk factors of poor visual outcome with vitrectomy for early-onset endophthalmitis after cataract surgery. PATIENTS AND METHODS: Clinical records of 29 consecutive eyes with endophthalmitis developing within 6 weeks after cataract surgery and that underwent therapeutic vitrectomy between June 1996 and April 2001 were retrospectively reviewed. Twenty-two of the eyes received intravitreal injections of vancomycin and ceftazidime at the time of vitrectomy, and all patients received intravenous antibiotics. Eyes were divided into two groups; group A consisted of 22 eyes with a final visual acuity of 0.2 or greater, and group B consisted of 7 eyes with a final visual acuity of less than 0.2. RESULTS: Fifteen eyes (52%) in group A achieved a visual acuity of 0.5 or better and 8(28%) achieved a visual acuity of 1.0, while 4 eyes in group B developed phthisis bulbi. For eyes with a preoperative visual acuity of hand motions or worse, there was no correlation between final visual acuity and preoperative visual acuity. The overall culture-positive rate was 57%. In group A, methicillin-resistant Staphylococcus epidermidis was identified in 6 eyes, methicillin-resistant Staphylococcus aureus (MRSA) in 3 eyes and enterococcus in 2 eyes. In group B, alpha-hemolytic streptococcus (AHS) was identified in 4 eyes, aspergillus in 1 eye, and MRSA in 1 eye. All isolates were sensitive to vancomycin with the exception of the aspergillus. AHS infection appeared to be associated with wound failure from the initial cataract surgery and a poor visual outcome. Among 3 of the eyes that developed phthisis bulbi, intravitreal injection of antibiotics was not performed. CONCLUSION: Early vitrectomy and intravitreal injection of vancomycin may improve visual outcomes, but infection with AHS may be associated with cataract surgery wound failure and poor visual outcomes.

Aged↗

PubMed2003

[Sclerally fixated intraocular lens implant associated with vitrectomy: a study of 50 cases].

INTRODUCTION: We present a retrospective study of 50 cases of scleral fixation of intraocular lenses (IOLs) associated with vitrectomy. MATERIALS AND METHODS: From January 1996 to June 2001, 50 consecutive patients who underwent surgery with insertion of a sclerally fixated intraocular lens implant associated with vitrectomy were studied. Indications included luxated lenses due to ocular contusion, cataract surgery complicated by capsular rupture and luxated nucleus or implant into the vitreous, and replacement of anterior chamber lenses. The implant was sutured 2 mm behind the limbus into the scleral sulcus with 10.0 Prolene. Vitrectomy was performed to treat pre-existing maculopathy, remove the lens or lens fragments luxated into the vitreous or to remove a luxated implant, and to provide for complete retinal examination during the operation. RESULTS: With a mean follow-up of 30 months, the mean postoperative visual acuity was 20/30. For 95% of cases, final visual acuity was improved compared to preoperative visual acuity. No postoperative complications due to the implant were encountered. There were four cases of cystoid macular edema and two cases of retinal detachment. DISCUSSION: Despite the macula edema and retinal detachments, there was no loss of visual acuity compared to the preoperative state. There were eight cases of raised intraocular pressure; seven were controlled medically and one after hemi-cyclocryo-therapy. CONCLUSIONS: Scleral fixation of an IOL is a reliable means of correcting aphakia in the absence of capsular support and may be associated with a vitrectomy with very little risk.

Aged↗

PubMed2004

Results of combined surgery by phacoemulsification and vitrectomy.

BACKGROUND: Eyes scheduled for posterior segment surgery may have cataract, which obscures the visualization of the retina. Surgery may be carried out either by a two-step procedure: i.e., removal of the cataract followed later by posterior segment surgery; or it may be done in a single session: i.e., combined surgery of both the anterior and posterior segments. OBJECTIVE: To evaluate the outcomes of combined surgery by phacoemulsification and vitrectomy. METHODS: We retrospectively reviewed the records of 42 patients with coexisting cataract and vitreoretinal disease who underwent combined surgery by phacoemulsification and pars plana vitrectomy at one session. RESULTS: Indications for surgery were vitreous hemorrhage in 71.4%, retinal detachment in 11.9%, macular hole in 11.9%, and epiretinal membrane in 4.8%. There were no significant intraoperative complications. The main early postsurgical complications were fibrinous formation in 11.9%, elevated intraocular pressure in 23.8%, and recurrent vitreous hemorrhage in 9.5%. There were a few late complications related to phacoemulsification: posterior synechia in 9.5%, posterior capsular opacification in 7.1%, and dislocating intraocular lens in 4.8%. Recurrent retinal detachment occurred in five eyes and rubeoisis iridis in one. Visual acuity was improved in 85.8%, stable in 7.1% and worse in 7.1%. CONCLUSIONS: Phacoemulsification performed at the time of posterior segment surgery enables good visualization during the vitrectomy, facilitates surgery, and is associated with only minor complications. In cases with cataract and vitreoretinal diseases, combined surgery by phacoemulsification and vitrectomy in one session may be considered.

Aged↗

PubMed2004

Prognostic factors in open eye injury managed with vitrectomy: retrospective study.

AIM: To evaluate surgery results and establish prognostic factors that predicted final functional (good or poor vision) and anatomic (final retinal detachment) outcome in open eye injury involving the posterior segment managed with pars plana vitrectomy. METHODS: Medical records of 52 consecutive patients with open eye injury involving the posterior segment were retrospectively reviewed. Specific variables of a system for classifying mechanical injuries of the eye were analyzed: the type of injury (defined by the mechanism of injury), grade of injury (defined by initial visual acuity), zone of injury (defined by the location of the wound), and relative afferent pupillary defect. Additional variables, such as wound length, retinal detachment, endophthalmitis, and timing of vitrectomy, were also included in the analysis. Final visual outcome and retinal attachment rate were recorded. Data were analyzed with chi-square test, univariate analysis for predictors, and multivariate logistic regression analysis. RESULTS: After a mean follow up of 20.0+/-10.5 months, 50% of eyes achieved visual acuity 0.5 or better, 27% of eyes achieved visual acuity 0.1 or worse, and 10% of eyes had final retinal detachment. According to univariate analysis results, the following parameters were predictors of good vision (visual acuity > or =0.5 in comparison with visual acuity <0.5): grade of injury (p=0.008), zone of injury (p=0.01), afferent pupillary response (p<0.001), wound length (p=0.002), and initial retinal detachment (p=0.009). The predictors of poor vision (visual acuity < or =0.1 in comparison with visual acuity >0.1) were zone of injury (p<0.001), relative afferent pupillary defect (p<0.001), wound length (p=0.002), and initial retinal detachment (p<0.001). Relative afferent pupillary defect (p=0.003) and initial retinal detachment (p<0.001) were predictors of final retinal detachment with proliferative vitreoretinopathy. However, multivariate logistic regression analyses revealed that relative afferent pupillary defect was the only significant factor for poor visual acuity (odds ratio, 10.3; 95% confidence interval, 1.1-92; p=0.04). On the other hand, none of the variables was a significant independent predictor for either good visual acuity or final retinal detachment. CONCLUSION: Half of the eyes with a good final visual outcome in our study were successfully managed with pars plana vitrectomy for open eye injury after trauma. The classification system may become useful prognostic tool for visual outcome in posterior segment ocular injuries managed with vitrectomy. Relative afferent pupillary defect as a functional test is a good predictor for visual outcome.

Adolescent↗

PubMed2004

[Primary intention to treat intraocular metallic foreign body using radical vitrectomy].

In order to compare the prognosis of eyes with a metallic intraocular foreign body withdrawn with a complete versus incomplete vitrectomy, our retrospective study analyzes the functional result and complications in a consecutive series of 13 eyes, depending on whether the vitrectomy included or not the removal of the posterior hyaloïd and the shaving of the vitreous base. Six eyes underwent one of these 2 surgical maneuvers. Three eyes underwent both of these 2 maneuvers and ended up with 10/10 visual acuity and no complications or reoperations. Among the 4 eyes that did not benefit from any of these 2 maneuvers, 3 required a vitrectomy revision because of a retinal detachment or a secondary hemorrhage. We conclude that a radical vitrectomy could improve the prognosis of eyes with an intraocular metallic foreign body.

Adult↗

PubMed2004

[Study of retinal damage in rabbit eyes induced by air infusion during vitrectomy].

OBJECTIVE: To investigate the histologic and physiologic changes in rabbit retina damaged by infusion air and to explore the mechanism of vision defects after vitreoretinal surgery. METHODS: Twenty four pigmented rabbits were randomly divided into three groups of eight each, a standard three port vitrectomy followed by fluid-air exchange was performed in 16 eyes, humidified air was infused with an air pressure of 25 or 40 mm Hg and then the vitreous cavity was refilled with balanced salt solution. As a control, vitrectomy without fluid-air exchange was performed in the remaining eight eyes. Clinical examinations and electroretinography were performed before and after the operation. Six weeks after the operation, the rabbits were sacrificed, their eyes were enucleated and examined by light and electron microscopy. RESULTS: One day postoperatively, the value of bA ratio of group A and group B decreased significantly. Six weeks later, the physiologic function of eyes in group A seemed to have a tendency to recover while that of group B not. With light microscopy, the retina opposite the infusion location in eyes of group B was disorganized, with loss of some layers of sensory retina, and the thickness of total retina and the outer layer of the retina was sharply reduced, the changes in the latter appeared more prominently. With electron microscopy, marked lesions were observed in the nerve fiber layer and photoreceptor cells in eyes of group B, the pathologic changes in group A were slighter than that of group B. In contrast, no morphologic change was present in the control eyes. CONCLUSION: Irreversible changes were produced in rabbit retina by air infusion during vitrectomy. The damages are more serious in the eyes perfused with higher air pressure. Air infusion during vitrectomy may be one of the main factors producing vision defects.

Air↗

PubMed2005

[Vector analysis of surgically induced astigmatism after combined operation of phacoemulsification, intraocular lens implantation and pars plana vitrectomy].

BACKGROUND: To evaluate the changes in corneal shape after phacoemulsification, PC IOL implantation and pars plana vitrectomy. MATERIAL AND METHODS: This study comprised 25 eyes of 25 patients who received phacoemulsification, 5.5 mm PMMA IOL implantation through 6 mm clear cornea incision with one single suture, and pars plana vitrectomy in one step - group A. To unique and compare the differences in surgical induced astigmatism (SIA) between combined procedures and two steps procedures, 2 control groups in one step surgery (only phacoemulsification with PCIOL--group B or only pars plana vitrectomy--group C) with the same shape and location of incision in cataract surgery and sclerotomy sites were analyzed. RESULTS: The highest value of SIA was in group A which was not statistic significant different than group B (p = 0.97). In-group C, SIA was the lowest, and there was also not significant difference between groups A (p = 0.063). The differences in SIA between group B and C were statistic irrelevant too. (P = 0.09) Shifts in axis to with the rule component were noted in 43.9 % of cases in-group A, 40.79% in-group B, and 58.96% in-group C. The highest shift in axis to against the rule meridian was observed in-group B (tab. 2) and in direction with the rule in-group C. CONCLUSIONS: No statistical significance was observed in the amounts of the induced astigmatism and refractive cylinder among the group of combined phacoemulsification, IOL implantation and pars plana vitrectomy. However, optical rehabilitation can be delayed by a postoperative astigmatism.

Aged↗

PubMedDate not supplied

Sutureless limited vitrectomy for positive vitreous pressure in cataract surgery.

A sutureless transconjunctival pars plana vitrectomy with the 25-gauge transconjunctival vitrectomy system is used to facilitate phacoemulsification in eyes with positive posterior vitreous pressure and shallow anterior chamber. Peribulbar local anesthesia is administered. In eyes with shallow anterior chamber, if an injection of a viscoelastic substance through anterior chamber paracentesis fails to deepen the anterior chamber, a limited pars plana vitrectomy is performed to remove a small amount of retro-lental vitreous (approximately 0.2 to 0.3 cc) with a 25-gauge high-speed cutter. Phacoemulsification is subsequently performed. The limited pars plana vitrectomy reduces the chances of intraoperative vitreous loss and suprachoroidal hemorrhage. It also increases the anterior chamber depth, facilitates intraoperative steps such as pupil stretching and capsulorhexis, and results in a phacoemulsification procedure that is less complex and safer.

Equipment Design↗

PubMed2006

Cool phaco in combined phacoemulsification and vitrectomy surgery.

PURPOSE: The aim of this paper is to present the use of bimanual phacoemulsification technique in combined phacoemulsification and vitrectomy surgery. MATERIAL AND METHODS: Combined phacoemulsification and vitrectomy procedure was performed in 20 eyes. Phacoemulsification was performed through two paracenteses. Soft acrylic intraocular lenses were implanted into the capsular bag through a paracentesis 1.8 mm wide. Standard three-port pars plana vitrectomy followed. Indications for vitrectomy were diabetic retinopathy, retina detachment, uveitis, macula hole. All surgeries were performed as one-day surgeries. Follow-up lasted six months. RESULTS: Visual acuity improved in 19/20 eyes (95%). The achieved functional results were similar to that achieved in standard phacoemulsification combined with vitreoretinal surgery. Surgery time did not differ significantly from time needed to perform a standard procedure. The bimanual technique allowed the stablization of the anterior chamber during vitreoretinal surgery. No serious postoperative complications occurred. CONCLUSIONS: The presented method improves the quality of combined surgery, ensures stability of the anterior chamber, reduces postoperative astigmatism, lowers the risk of inflammation.

Adolescent↗

PubMed2006

[Efficacy of intravitreal triamcinolone acetonide in the visualization of the vitreous during pars plana vitrectomy].

PURPOSE: To retrospectively evaluate the efficacy of triamcinolone acetonide (TA) injection during pars plana vitrectomy, to facilitate the visualization of the internal limiting membrane (ILM), residual vitreous cortex (RVC) and preretinal membranes. MATERIAL AND METHODS: Pars plana vitrectomy was performed in 164 patients due to rhematogenous retinal detachment, vitreous hemorrhage, macular hole, lens luxation, endophthalmitis, intraocular foreign body, malignant glaucoma, preretinal membrane and proliferative diabetic retinopathy. After surgical separation of the posterior vitreous and removal of any visible epiretinal membrane, TA suspension was injected over the posterior pole into the vitreous cavity. Then, visualized RVC was removed and ILM peeling was performed. RESULTS: Upon intravitreal injection of TA, vitreous and ILM could be visualized by numerous particles of TA dispersed as white specks. RVC and ILM were completely removed in all patients. No complications related to the use of TA were encountered, even after complex procedures such as, vitrectomy combined with scleral buckling or phakoemulsification surgery in a long term follow up. CONCLUSIONS: Intraoperative visualization of RVC and ILM with intravitreal TA was found to be a useful adjunct to pars plana vitrectomy. This technique may facilitate both removal of epiretinal membrane and separation of vitreous, especially in patients with undetached vitreous.

Adolescent↗