Publications by authors named "Marcio Bittar Nehemy"
A 69-year-old female was referred with sudden unilateral painless decreased vision that began 2 days after uncomplicated cataract surgery in the left eye. Visual acuity was hand motion and biomicroscopy showed a mild anterior chamber reaction, no hypopyon, and an intraocular lens that had been placed within the capsular bag. A dilated fundus examination revealed optic disk edema, widespread deep and superficial intraretinal hemorrhages, retinal ischemia, and macular edema.
View Article and Find Full Text PDFWe report three cases of refractory chronic endophthalmitis after cataract surgery presenting to a referral center, and with repeated negative cultures. Initial treatment consisted of intravitreal and systemic antibiotics, with partial improvement. After subsequent worsening, pars plana vitrectomy, intraocular lens explantation and en bloc capsulectomy were performed.
View Article and Find Full Text PDFIntroduction: Vision impairment and blindness have been significantly associated with high medical care expenditures, decrease in health utility, and loss or reduction of productivity. The objective of this study was to assess the humanistic and economic burden of blindness in a Brazilian sample from a societal perspective.
Methods: Cross-sectional, observational, and multicenter study enrolling individuals with blindness (defined as the best corrected visual acuity less than 6/60 in the better-seeing eye) caused by retinal disorders.
Article Synopsis
- The study aimed to assess eye-related and molecular aspects in eight patients diagnosed with neurofibromatosis type 2 (NF2), focusing on new mutations and variations in eye symptoms.
- Comprehensive eye exams revealed a range of visual issues, from minor retinal changes to severe congenital damage, with six notable mutations identified, including three new ones.
- The findings emphasize the rarity of NF2 and the necessity for more research to understand the relationship between genetic factors and observed symptoms.
Purpose: To investigate the correlation between the length of external limiting membrane (ELM), ellipsoid zone (EZ) and interdigitation zone (IZ) defects and visual prognosis in patients undergoing macular hole (MH) surgery, using spectral-domain optical coherence tomography (SD-OCT).
Methods: This is a retrospective, consecutive, observational case series study. Fifty-two eyes of 52 patients with primary MH were evaluated.
Purpose: To investigate the effect of vitreomacular adhesion (VMA) on the outcome of antiangiogenic treatment for neovascular age-related macular degeneration (AMD).
Methods: Ninety-nine eyes of 83 patients were used in our cohort study. We prospectively evaluated best corrected visual acuity (BCVA) and central retinal thickness (CRT) in patients with neovascular AMD at baseline and 1, 2, 3, 6, and 12 months after treatment with anti-vascular endothelial growth factor (anti-VEGF) agents.
Purpose: Neurofibromatosis type 2 (NF2) is an autosomal-dominant disease, characterized by bilateral vestibular schwannomas, multiple central nervous system (CNS) tumors, skin tumors, and juvenile cataract. The present study assessed retinal abnormalities using spectral-domain optical coherence tomography (SD-OCT) in a case series of NF2 patients.
Methods: Nine NF2 patients from the neurofibromatosis outpatient reference center of the Federal University of Minas Gerais, in Brazil, were submitted to a complete anamnesis and a detailed ophthalmic evaluation, including SD-OCT, to detect retinal lesions.
Purpose: To evaluate the epidemiologic characteristics of patients 0-7 years of age with visual impairment registered at a university hospital low vision service in Brazil.
Methods: The medical records of visually impaired patients were retrospectively reviewed for sociodemographic characteristics and ocular and associated deficiencies. In addition to biographical information, the following data were collected: ocular disorders, diagnosis, affected anatomic region, etiology, and avoidable or unavoidable causes.
Objective: To investigate the association between CFH gene polymorphism and response to ranibizumab in Brazilian patients with neovascular age-related macular degeneration (AMD).
Methods: 95 patients were genotyped for the CFH rs1061170 (Y402H) single nucleotide polymorphism. Patients with neovascular AMD initially received intravitreal ranibizumab injections for three months and were retreated as needed.
Background/aims: To investigate the association between VEGF gene polymorphism and response to ranibizumab in neovascular age-related macular degeneration (AMD).
Methods: A total of 92 patients were genotyped for the VEGF rs1413711 single nucleotide polymorphism. Patients with neovascular AMD initially received 3 monthly ranibizumab intravitreal injections and were retreated as needed.
Purpose: To investigate the association between VEGF gene polymorphism and age-related macular degeneration (AMD) in a Brazilian cohort.
Methods: We examined 160 affected individuals and 140 sex- and age-matched controls recruited at the Vision Institute and the Retina Department, São Geraldo Hospital, Minas Gerais Federal University, Brazil, between 2007 and 2011. Genotyping for the VEGF rs1413711 single nucleotide polymorphism (SNP) (+674C>T) was performed.
Vitreous cyst is a rare condition of the posterior segment of the eye. It can occur in eyes with coexistent ocular diseases or in eyes that are otherwise normal. This study reports a case of vitreous cyst in a patient with retinitis pigmentosa and presents its clinical and ultrasonographic features.
View Article and Find Full Text PDFAge-related macular degeneration (AMD) is the most frequent cause of irreversible blindness in the elderly in developed countries. Although the etiology of AMD remains largely unknown, numerous studies have suggested that both genes and environmental risk factors significantly influence the risk of developing AMD. Recently, single nucleotide polymorphisms, DNA sequence variations found within the complement factor H (CFH) gene, have been found to be strongly associated with the development of AMD.
View Article and Find Full Text PDFPurpose: To evaluate the pattern of retinal integration and differentiation of mesenchymal stem cells (MSCs) injected into the vitreous cavity of rat eyes with retinal injury.
Methods: Adult rat retinas were submitted to laser damage followed by transplantation of DAPI-labeled BM-MSCs grafts. To assess the integration and differentiation of BM-MSCs in laser-injured retina, host retinas were evaluated 2.
Purpose: To describe the use of 4 mg intravitreal triamcinolone acetonide (IVTA) for gyrate atrophy-related macular edema (ME) and to report anatomic and functional outcomes, during a nine-month period.
Case Report: A 27-year-old female complained of decreased vision since diagnosis of gyrate athrophy (GA), six years before admission. At presentation visual acuity was 20/100 in OD and 20/80 in OS.
Purposes: To evaluate the correlation between anatomical changes (hard druses, soft druses, hyperpigmentation, new vessels, detachment of retinal pigment epithelium, hypopigmentation and chorioretinal atrophy) and light sensitivity in patients with age-related macular degeneration (ARMD); analyze macular sensitivity in areas with no anatomical lesions in patients with ARMD and compared them to the control group in order to detect if there was any functional lesion in areas with no anatomical changes.
Methods: A cross-sectional, comparative, descriptive and analytic study was performed. The case group consisted of 31 subjects with ARMD aged between 51 and 88 years.
Several entities must be considered when a patient presents with a white dot syndrome. In most cases these can be distinguished from one another based on the appearance or distribution of the lesions, the clinical course, or patient variables such as age, sex, laterality, and functional and image examinations. In this paper we review the distinctive and shared features of the white dot syndromes, highlighting the clinical findings, diagnostic test results, proposed etiologies, treatment, and prognosis.
View Article and Find Full Text PDFThe authors report a case of a patient who underwent cataract surgery with implantation of a posterior chamber intraocular lens and presented endophthalmitis on the second postoperative day. She was treated with intravitreal injection of amikacin, vancomycin and dexamethasone. After resolution of the infection the patient presented macular infarction and important loss of visual acuity due to amikacin toxicity.
View Article and Find Full Text PDFAge-related macular degeneration (ARMD) is a major source of legal blindness in individuals older than 50 years. Even though recent reports suggest that genetics plays an important role, its pathogenesis remains puzzling and the risk factors for its occurrence are not completely established. Vitamin and mineral supplementation reduced the risk of development of choroidal neovascularization (CNV) or progression to the most advanced stages of age-related macular degeneration.
View Article and Find Full Text PDFPurpose: To determine if pars plana vitrectomy induces long-term changes in the anterior segment anatomy by means of ultrasound biomicroscopy.
Methods: A prospective case series study was undertaken of consecutive patients referred to a tertiary eye care centre for pars plana vitrectomy as the only procedure. Twenty eyes of 20 patients undergoing pars plana vitrectomy alone were studied by ultrasound biomicroscopy.
Purpose: To report the incidence of infectious and noninfectious endophthalmitis after intravitreal injection of 4 mg of triamcinolone acetonide (Kenalog - 40 mg/ml; 0.1 ml) and to evaluate distinguishing characteristics that may assist the clinician in differentiating these entities.
Design: Observational nonconcurrent prospective study.