Facoanafilaxia por cristalino mergulhado na Síndrome de Marfan / Phacoanaphylactic by dislocation of the lens in the Marfan Syndrome

Resumo A síndrome de Marfan é uma doença de herança autossômica dominante e que afeta o tecido conjuntivo com manifestações fenotípicas que envolvem os sistemas esquelético, cardiovascular e ocular. As principais manifestações oculares são a subluxação do cristalino, a miopia e o descolamento da retina. O objetivo deste artigo foi relatar a conduta clínico-cirúrgica de um paciente portador da síndrome de Marfan com cristalino luxado para a cavidade vítrea e que evoluiu com severa reação facoanafilática caracterizada por um glaucoma secundário severo e descompensação corneana.

Abstract Marfan syndrome is an autosomal dominant inheritance disease that affects connective tissue with phenotypic manifestations involving the skeletal, cardiovascular and ocular systems. The main ocular manifestations are the subluxation of the lens, myopia and retinal detachment. The aim of this article was to report the clinical and surgical management of a patient with Marfan syndrome with luxated lens for the vitreous cavity and who developed a severe phacoanaphylactic reaction characterized by severe secondary glaucoma and corneal decompensation.

Surgical management of intraocular lens dislocations / Tratamento cirúrgico dos deslocamentos de lentes intraoculares

ABSTRACTPurpose:To report and compare the surgical, visual, and anatomical outcomes following treatment of dislocated intraocular lenses (IOLs).Methods:The medical records of 28 eyes of 28 patients were evaluated. Age, gender, pre-and postoperative best-corrected visual acuity (BCVA), surgical methods, and complications were recorded.Results:Pre-and postoperative BCVA ranged from counting fingers to 20/32 and from counting fingers to 20/25, respectively. Late-onset dislocations were the most frequently observed complication. The most frequent surgical method was IOL repositioning in 15 of 28 patients, followed by IOL exchange in 11 patients, and IOL removal in 2 patients. Only 1 patient required surgical re-intervention with IOL capture.Conclusions:Visual acuity improved following the use of either IOL repositioning or IOL exchange. No superiority of one method over the other was observed. In the present retrospective case series, management of dislocated IOLs with repositioning or exchange of the primary implant conferred comparable surgical and visual outcomes.

RESUMOObjetivo:Relatar e comparar as abordagens cirúrgicas e os resultados visuais e anatômicos no tratamento de lentes intraoculares (IOL) deslocadas.Métodos:Foram avaliados os registros médicos de 28 olhos de 28 pacientes. Idade, sexo, melhor acuidade visual corrigida pré e pós-operatória, abordagens cirúrgicas e complicações foram registrados.Resultados:Melhor acuidade visual corrigida pré e pós-operatória variou de conta dedos a 20/32 e de conta dedos a 20/25, respectivamente. Os deslocamentos tardios foram os mais frequentemente encontrados. A cirurgia mais frequente foi o reposicionamento da IOL em 15 dos 28 pacientes, em seguida, o troca da IOL em 11 pacientes, e a remoção da IOL em dois pacientes. Apenas um caso de necessitou de reintervenção devido à captura da IOL.Conclusões:A acuidade visual melhorou em ambas as abordagens, reposicionamento e troca de IOL. Não houve superioridade de um método sobre o outro. Na presente série de casos retrospectiva, o tratamento do deslocamento de IOL com reposição ou troca do implante primário gerou resultados cirúrgicos e visuais comparáveis.

State of the art in chromovitrectomy / Estado da arte da cromovitrectomia

Vitrectomy is a surgery that involves complex and delicate techniques that treat diseases such as macular hole, epiretinal membrane and diabetic macular edema. Chromovitrectomy is one of these techniques and includes the use of coloring agents such as vital dyes or crystals to enhanced visibility of transparent structures during vitrectomy. The aim of this study was to present a modern approach, based on scientific evidence, about the application and indication of vital coloring agents during vitrectomy. The use of such agents has made this surgery more predictable and has increased its post-operative prognosis. Although research on chromovitrectomy is currently expanding there is still not an established gold standard dyeing agent.

A cirurgia vitreorretiniana é uma cirurgia que envolve técnicas complexas e delicadas que tratam doenças como buraco macular, membrana epirretiniana e o edema macular diabético. A cromovitrectomia é uma dessas técnicas que incluem o uso de corantes compostos de pigmentos vitais ou cristais para melhorar a visibilização de estruturas transparentes durante a cirurgia de vitrectomia. O objetivo desse artigo foi apresentar uma abordagem atual, baseada em evidências, sobre a aplicação e indicação de corantes vitais durante a cirurgia vitreorretiniana. O emprego desses corantes possibilitou uma maior previsibilidade para a cirurgia, melhorando assim seu prognóstico pós-operatório. Apesar do campo da cromovitrectomia está em plena expansão de pesquisas, um corante gold standard para cromovitrectomia ainda não está estabelecido.

Fibrose sub-retiniana progressiva: relato de casos / Progressive subretinal fibrosis: case reports

A síndrome da fibrose sub-retinina é uma doença rara e considerada como parte de um grupo de condições que recebem a denominação de síndrome dos pontos brancos. No entanto, alguns autores a consideram como uma entidade distinta dessas outras doenças com características próprias. Com os casos apresentados, podemos observar muitas dessas características já descritas, como localização e aspecto clínico das lesões, sua evolução e o prognóstico visual final. Seu diagnóstico é muito importante a se considerar em diversos tipos de uveíte, pois o tratamento precoce pode evitar o acometimento bilateral.

The subretinal fibrosis syndrome is a rare disease and is considered part of a group of conditions that are denominated white dots syndrome. However, some authors consider it like a distinct entity from the others diseases with you own features. With these cases we can behold many features already described, like localization and clinical aspect of the lesion, your evolution and the final visual prognosis. It's diagnostic is very important to consider in a varied type of uveitis, because the treatment can avoid the bilateral involvement.

A case of endophthalmitis associated with limbal relaxing incision.

Limbal relaxing incisions (LRIs) are considered a relatively safe procedure with rapid stabilization and absence of infectious complications. Do we need to readdress this last impression? We report a case of nocardia endophthalmitis associated with an exudate at the site of an LRI in a patient who underwent routine cataract surgery. This case, to the best of our knowledge, is the first report of its kind, stressing the need for a cautious approach to the adoption of this method of astigmatic correction.

A study on the incidence, microbiological analysis and investigations on the source of infection of postoperative infectious endophthalmitis in a tertiary care ophthalmic hospital: An 8-year study.

Background: The objective of the study was the determination of the incidence of culture-proven postoperative endophthalmitis and probable sources of infection. Materials and Methods: It was a prospective study on the microbiology, incidence and probable sources of infection in patients with postoperative infectious endophthalmitis carried out in a tertiary care eye hospital. Consecutive patients diagnosed with postoperative infectious endophthalmitis during the years 2000-2007 were investigated for the causative infective agent and possible sources of infection. The surgical data and microbiological data including the investigations performed to trace the source were recorded in a specific formatted form and were gathered and compiled for analysis. Results: Data of analysis showed that 98 (0.042%) out of 2,31,259 patients who underwent intra-ocular surgery developed infectious endophthalmitis. Among these, 70 (0.053%) occurred after cataract, 10 (0.5%) after penetrating keratoplasty (PK) and 18 (0.018%) following other types of intra-ocular surgeries. The predominant infectious agents isolated were bacteria (89.7%), with equal proportions of Gram-positive and Gram-negative bacteria. Polymicrobial infection was noted in four and fungi in seven patients. Occurrence of postoperative endophthalmitis was sporadic and not related to any specific part of period in a year. Sources of infection were donor corneal rim in six post-PK patients and phaco probe in one who had postphacoemulsification endophthalmitis Conclusions: Overall incidence of postoperative endophthalmitis over an 8-year period was quite low. The sources of infection could be established in six post-PK endophthalmitis patients and in a postcataract surgery.

Intravitreal cysticercosis presenting as neovascular glaucoma.

We report two cases of intraocular cysticercosis which showed a peculiar presentation of neovascular glaucoma which is hitherto unreported. Two young adults presented with symptoms of raised intraocular pressure due to neovascular glaucoma. On dilated fundus examination both were found to have dead intravitreal cysticercosis. The cysts were removed by a three-port vitrectomy and intracameral injection of bevacizumab was given to help in the regression of rubeosis. Trabeculectomy had to be combined in one case. The intraocular pressure returned to normal. No recurrence of rubeosis was seen even after one year.

Comparison of classic peribulbar anesthesia and new entry point [single percutaneous injection technique] in vitroretinal surgery

To describe the method that seeks to improve the administration of regional anesthesia for vitroretinal surgery avoiding the risk of potential complications associated with other techniques through comparison of safety and efficacy of classic peribulbar anesthesia versus single percutaneous technique using a prospective, randomized clinical trial. One hundred patients were randomized to classic peribulbar and single percutaneous peribulbar technique after informed consent. Pain during administration of anesthesia, during surgery was graded on a visual analogue pain scale and compared for both techniques. Globe akinesia, analgesia and IOP measurements before and after administration of anesthesia, detection of distribution of local anesthetic agent by ultrasound scanning and complications related were also compared. Twenty out of 50 [40%] patients of group 1[classic pirebulbar] and 36/50 [72%] of group II [single percutaneous technique] experience no pain during administration of anesthesia. Scores for globe akinesia and anesthesia were less satisfactory in group 1 and supplemental blocks required in 8% of the patients while in group II all of the patients [100%] showed proper globe akinesia and anesthesia. There were significant elevation in mean IOP following injection in both groups and the incidence of subconjunctival haemorrhage, chemosis and echymosis were more frequent in group 1. Single percutaneous peribulbar technique proved to be a safe and efficient technique that offers excellent anesthesia and akinesia with less complication for various ophthalmic procedures

Peribulbar block in pediatric posterior segment ocular surgery

Vitreous and retinal [VR] surgery with or without scleral buckling is associated with significant postoperative pain in adults, and recent studies have addressed the effect of retro or peribulbar block on these parameters VR surgery in children has received little attention regarding the incidence of pain and the role of regional anesthesia in modifying these parameters. In this study, we compared peribulbar block with conventional opioid analgesia in children undergoing VR surgery. In a prospective, randomized, single-blind study, 85 children [age 8 to 14 years] were allocated to receive peribulbar block [n = 42] or intravenous fentanyl 2micro g/kg [n = 43] after induction of general anesthesia. Parameters compared were: Intraoperative incidence of oculocardiac reflex and requirement for additional analgesic; postoperative pain intensity; time to first analgesic, total number of postoperative analgesic supplements; and parental assessment of the child's postoperative comfort at 24 hours. The incidence of intraoperative oculocardiac reflex was significantly less in the peribulbar group [p = .0001]. Significantly more children receiving peribulbar block were pain free on awakening [p = .0004] and throughout the postoperative period. The number of children requiring opioid was significantly lower with peribulbar block [p = .008]. Peribulbar block appears to be a safe and clinically superior alternative to intravenous fentanyl for pediatric VR surgery

Risk factors for posterior capsule rupture and vitreous loss during phacoemulsification

To determine the rate and risk factors of vitreous loss during phacoemulsi-fication in patients with cataracts operated by ophthalmology residents and fellows at Labbafinejad Medical Center. This prospective descriptive study included consecutive patients with cataracts undergoing phacoemulsification over a one year period. All patients were operated under local or general anesthesia using the divide and conquer technique. Preoperatively, all patients underwent a complete ocular examination including measurement of visual acuity, slitlamp biomicroscopy, intraocular pressure measurement, and dilated funduscopy. Main outcome measures included the rate of posterior capsular rupture and vitreous loss as well as associated risk factors such as surgical experience, ocular and systemic conditions, and type and severity of the cataract. Overall, 767 eyes of 767 patients with mean age of 63.7 +/- 10.3 [range, 25-91] years were operated. The overall rate of vitreous loss was 7.9% which was 5-fold greater in the hands of residents as compared to fellows. Among different factors, older age, female sex, small pupil, small capsulorrhexis, presence of pseudoexfoliation, and high myopia were significantly associated with vitreous loss. The highest rate of vitreous loss occurred in patients with dense nuclear cataracts. Considering the higher rate of vitreous loss in patients operated by ophthalmology residents; patients with known risk factors for vitreous loss should better be operated by more experienced surgeons

Triamcinolone-assisted 3D-vitrectomy in diabetic vitreomacular traction / Vitrectomia 3D guiada por triancinolona na tração vitreomacular do diabetes

PURPOSE: To evaluate the efficacy of triamcinolone as an aid in vitreous visualization during 3D-vitrectomy for the treatment of diabetic vitreomacular traction. METHODS: Prospective interventional study in patients with symptomatic vitreomacular traction. Pre- and postoperative assessments included visual acuity, retinography, intraocular pressure and optical coherence tomography. All patients were operated by the same surgeon (OOMJ). Triamcinolone was used as a visual enhancer during surgery. The parameters of the vitreophage (Accurus 800CS, Alcon) were set to the 3D- system (dual dynamic drive), contact lenses (plain and wide angle) being used for visualization. Peripheral 360º vitreous circumcision at high cut rate was performed, carefully releasing the vitreomacular adhesion at the posterior pole by means of an appropriate pic or vitreoretinal forceps. RESULTS: The sample consisted of five consecutive patients (five eyes), three female and two male, with symptomatic vitreomacular traction. Their age ranged from 54 to 71 years (mean 62.6 ± 6.3 years). During the surgical procedure, the areas with vitreomacular traction were properly visualized and identified after the application of triamcinolone. No complications were recorded during or after surgery. There was a statistically significant improvement in visual acuity after the surgical procedure (p=0.0313). CONCLUSION: Triamcinolone facilitates the surgical treatment of vitreomacular traction by improving visibility of both the vitreous humor and the vitreous-retina interface. Triamcinolone-assisted 3D vitrectomy proved to be an effective procedure in these cases.

OBJETIVO: Avaliar a eficácia da triancinolona como marcador vítreo na vitrectomia 3D para tratamento da tração vitreomacular do diabetes. MÉTODOS: Realizou-se um estudo prospectivo intervencionista numa série de portadores de tração vitreomacular sintomática. Na avaliação pré e pós-operatória foram realizadas a medida da acuidade visual, retinografia, pressão intra-ocular e tomografia de coerência óptica. Todos pacientes foram submetidos à vitrectomia pelo mesmo cirurgião (OOMJ). No intra-operatório, utilizou-se triancinolona como marcador vítreo. Os parâmetros do vitreófago (Accurus 800CS, Alcon) foram programados no sistema 3D (dual dynamic drive), sendo utilizadas lentes de contato (grande angular e plana) para visibilização. Realizou-se circuncisão vítrea periférica 360° com alto corte, desfazendo cuidadosamente as adesões vitreomaculares no pólo posterior por meio de gancho ou pinças vítreo-retinianas adequadas. RESULTADOS: A amostra foi composta por cinco pacientes (cinco olhos) consecutivos com tração vitreomacular sintomática. Três eram do sexo feminino e dois, do masculino. A idade variou de 54 a 71 anos (média de 62,6 ± 6,3 anos). Durante o procedimento cirúrgico, os locais de tração vitreomacular foram identificados com boa visibilidade após aplicação da triancinolona. Não foram observadas intercorrências tanto no intra quanto no pós-operatório. Houve melhora estatisticamente significante na acuidade visual após procedimento cirúrgico (p=0,0313). CONCLUSÃO: A triancinolona tem ação facilitadora no tratamento cirúrgico da tração vitreomacular, por melhorar visibilização tanto do humor vítreo quanto da interface vítreo-retina. A cirurgia de vitrectomia 3D, guiada por triancinolona, mostrou-se ser um procedimento eficiente nesses casos.

Illuminated curved 25-gauge vitrectomy probe for removal of subsclerotomy vitreous in vitreoretinal surgery.

Incarceration of vitreous in sclerotomy sites during pars plana vitrectomy can lead to wound-related complications similar to vitreous incarceration in cataract surgery. We describe an illuminated curved 25-gauge vitrectomy probe for removing vitreous from sclerotomy sites. Polyester tubing is used to secure a fiber optic endoilluminator (0.5 mm) with the curved 25-gauge vitrector (0.5 mm). The resultant illuminated curved vitrector (20 G) has a diameter of 1.0 mm. It facilitates complete removal of vitreous around the internal sclerotomies under direct visualization in both phakic and pseudophakic eyes. The same was confirmed with ultrasound biomicroscopy of the sclerotomy sites. Curved vitrector reduces postoperative complications related to incarcerated vitreous in phakic and pseudophakic eyes and other sclerotomy-related wound complications.

Base eletrônica de dados clínicos e cirúrgicos das doenças da retina e vítreo / Electronic clinical and surgical database of retina and vitreous diseases

OBJETIVOS:A proposta deste trabalho é criar base de dados clínicos e cirúrgicos informatizada, usando programa de computador (software), no qual pacientes com 19 doenças selecionadas da retina e vítreo possam ser incluídos. MÉTODOS: Foram selecionados os principais livros-texto da especialidade para que servissem de base estrutural do protocolo. Utilizou-se também artigos retirados de revistas e de bases de dados ligados à rede internacional de computadores (Internet). A informatização dos dados foi realizada através da interface do programa SINPE© (Sistema integrado de protocolos eletrônicos), desenvolvido no Laboratório de Informática e Multimídia do Programa de Pós-Graduação em Clínica Cirúrgica do Setor de Ciências da Saúde da Universidade Federal do Paraná. RESULTADOS: Com a informatização dos dados, criou-se o protocolo mestre, o qual abrange todo o conteúdo em pastas principais, seguido de 19 protocolos específicos originados do mestre e referentes às doenças com dados individualizados de cada uma. O programa, permite coleta de dados de pacientes com suas características clínicas, exames complementares, tratamento realizado e seguimento pós-tratamento. Qualquer fonte de interesse dentro do protocolo pode ser cruzada de acordo com o tipo de estudo desejado. CONCLUSÕES: Os objetivos deste trabalho que eram criar estrutura de informação abrangente e atualizada de doenças vitreorretinianas de interesse, adaptando estes dados a um programa computadorizado (software) específico e incorporar este dispositivo no SINPE© foram atingidos.

PURPOSE: The purpose of this study is to build an automated clinical and surgical database which works with a computer-based program (software), where patients with 19 selected retina and vitreous diseases are included. METHODS: Textbooks from both international and national authors served as a basic structure for the protocol. Specific articles related to each disease, extracted from scientific journals and from specific clinical database sources, searched on the World Wide Web (the internet) were used, as well. Data automation was done by interface with SINPE© (Integrated electronic protocol system) - a software developed at the Informatics and Multimedia Laboratory of the Health Sciences Department at the Universidade Federal do Paraná. RESULTS: Along with the data automation the master protocol was created covering all contents in main folders, followed by 19 specific protocols which refer to individual specifications for each disease. The program allows to collect and record data from patients with their clinical characteristics, diagnostic aids, selected treatment as well as follow-up treatment. Likewise, any source of interest in the protocol can be crossed with the Microsoft Excel® program depending on the type of study. CONCLUSIONS: The objective of this study which was to create a wide and updated database of vitreoretinal pathologies of major importance, converting them to a specific software and interfacing it with the SINPE© has been achieved.

Diabetic retinopathy: a preventable scourge.

In recent years, the India has witnessed a rapidly exploding epidemic of diabetes mellitus. It would not be hyperbolic to state that diabetes mellitus is the mother of morbidity of all vital organs. Diabetic retinopathy and its complications cause considerable ocular morbidity as well. With effective management strategies visual loss due to the disease can be controlled and further dissemination of the disease could be prevented. The key to proper management of diabetic retinopathy includes prophylaxis by controlling blood sugar, periodical screening of retina for early detection, prompt referral for prevention of progression by appropriate laser photocoagulation, surgical correction of various anatomical abnormalities, low vision aids and rehabilitative measures in patients with severe visual loss. Howerver, the awareness level of visual consequences of this widely prevalent disease even amongst diabetics is lacking.

Depósito subconjuntival de óleo de silicone após cirurgia vitreorretiniana / Subconjunctival deposit of silicone oil after vitreoretinal surgery

OBJETIVO: Comprovar a presença do óleo de silicone no espaço subconjuntival de pacientes submetidos previamente à cirurgia vitreorretiniana por meio de estudo histopatológico das amostras conjuntivais obtidas, nos quais o exame biomicroscópico não foi capaz de comprovar sua presença. Determinar qual a incidência da presença do óleo de silicone no espaço subconjuntival em uma série de casos e quais implicações clínico-patológicas. MÉTODOS: Estudo prospectivo em 30 olhos de 30 pacientes. Foram incluídos no estudo os pacientes que haviam sido submetidos previamente à cirurgia vitreorretiniana com implante intra-ocular de óleo de silicone e que possuíssem indicação para retirada do óleo de silicone e que não apresentassem ao exame biomicroscópico sinais da presença do óleo de silicone no espaço subconjuntival. Após sua retirada, a amostra era encaminhada para análise histopatológica pelo método de hematoxilina-eosina. RESULTADOS: Foi observada a presença de espaços vazios correspondentes às áreas de localização do óleo de silicone, removido durante processamento histológico, em 10 (33 por cento) amostras. Observou-se também a presença de sinais inflamatórios na substância própria caracterizada por congestão vascular, leucostase e infiltrado linfomononuclear em 27 (90 por cento) amostras. CONCLUSÃO: Portanto, em pacientes submetidos ao implante intra-ocular do óleo de silicone, devemos suspeitar que o óleo esteja presente no espaço subconjuntival, mesmo que o exame biomicroscópico pareça normal.

PURPOSE: To assess the histopathological findings of conjunctival specimens from patients submitted to vitreoretinal surgery with intraocular silicone oil injection. METHODOS: Prospective analyses of 30 eyes of 30 patients were evaluated. Before the patients underwent removal of the intraocular silicone oil, conjunctival excision was performed and submitted to histopathologic examination. RESULTS: The presence of empty spaces corresponding to silicone oil location was positive in 10 (33 percent) specimens. The presence of inflammatory cells, vascular congestion, leukostases, lymphocyte and monocyte infiltrates were positive in 27 (90 percent) specimens. The presence of silicone oil was positive in 10 (33 percent) specimens. Therefore, in those patients who undergo vitreoretinal surgery, silicone oil may be present in the conjunctiva or subconjunctival space, even if biomicroscopic examination seems to be normal. According to our knowledge, this is the first study with the purpose to assess the histopathological findings of conjunctival specimens from patients submitted to vitreoretinal surgery with intraocular silicone oil injection. CONCLUSION: Ophthalmologists should be aware of this possible complication after intraocular use of silicone oil after vitreoretinal surgery.

Clinical features, histopathological analysis and surgical treatment of a free floating vitreous cyst: a case report / Achados clínicos, análise histopatológica e tratamento cirúrgico de cisto livre no vítreo posterior: relato de caso

The authors present a report of a 44-year-old female patient, with complaints of visual disturbances in the left eye. The symptoms were present for at least 5 years and worsened in the last 2 years, impairing her activities. The patient reported perception of a floating circle, which blurred her vision. There was no previous history of trauma, infectious or inflammatory disease. Clinical evaluation included physical examination, laboratory testing, abdominal ultrasonography, thorax X-ray and head tomography. Ophthalmologic examination consisted of visual acuity, motility tests, biomicroscopy, tonometry and indirect ophthalmoscopy. Complementary investigation was done with a and b scan ocular ultrasonography. The chosen therapeutic approach to excise the cyst was pars plana vitrectomy, successfully performed. Anatomopathologic analysis revealed a pigmented vitreous cyst, of possible congenital origin, described as a cystic choristoma from the primitive hyaloid system. Benign evolution, clinical findings and histopathological analysis corroborated the diagnostic hypothesis of a cystic choristoma of the primitive hyaloid system. Surgery (pars plana vitrectomy) was successful and the patient returned with visual acuity of 20/20 in both eyes, and with no further complaints.

Os autores apresentam relato de um caso de paciente de 44 anos, com história de dificuldade visual no olho esquerdo há 5 anos. A paciente referia a sensação de um círculo flutuando em sua visão. Os sintomas pioraram nos últimos dois anos, prejudicando suas atividades. Não havia história pessoal prévia de trauma ou de doença ocular inflamatória ou infecciosa. A avaliação clínica incluiu o exame físico, exames de laboratório, ultra-sonografia abdominal, radiografia de tórax e tomografia de crânio e o exame oftalmológico consistiu em medida de acuidade visual, testes de mobilidade, biomicroscopia, tonometria e oftalmoscopia indireta. Investigação complementar foi realizada com ultra-sonografia ocular (modo A e B). A terapêutica escolhida para exérese do cisto foi a vitrectomia via pars plana, que transcorreu sem complicações. A análise anatomopatológica revelou cisto do vítreo, pigmentado, de presumível etiologia congênita, compatível com coristoma cístico do sistema hialóide primitivo. A evolução benigna, os achados clínicos e a análise anatomopatológica reafirmam a hipótese diagnóstica de coristoma cístico do sistema hialóide primitivo. A intervenção cirúrgica (vitrectomia pars plana) obteve sucesso no tratamento da paciente, que retornou apresentando acuidade visual de 20/20 em ambos os olhos, sem outras queixas.

Estudio de las degeneraciones vítreas y periféricas en la miopía / A study of vitreous degenerations and of peripheral degeneration in myopia

Se realizó un estudio transversal descriptivo de 50 pacientes entre los 20 y 50 años, divididos en cinco grupos de defectos refractivos con el diagnóstico de miopía desde enero de 2004 a julio de ese mismo año atendidos en el hospital provincial Manuel Ascunce Domenech en la consulta de retina .Se analizó el grado de miopía, las degeneraciones de las diferentes capas de la retina y se estableció una relación entre las degeneraciones periféricas y las alteraciones del vítreo (licuefacción, sinéresis y desprendimiento posterior del vítreo ya sea completo o parcial y grado de miopía .Se analizó la existencia de licuefacción, sinéresis y el desprendimiento posterior del vítreo que se correlaciona con la significación estadística en el mayor grado de miopía. La existencia de degeneraciones periféricas de la capa interna de la retina se relaciona estadísticamente con la existencia de licuefacción, sinéresis y desprendimiento posterior del vítreo, al igual que la de la capa externa. Se trabajó con el número de ojos y los cinco grupos de dioptrías mencionados para el análisis de los gráficos

Anestesia local en cirugía vitreorretinal y de polo anterior en pacientes menores de 20 años / Local anaesthesia for vitreoretinal and anterior segment surgery in patient under 20 year old

Introducción: Pese al aumento en el uso de anestesia regional en cirugía oftalmológica, esta técnica es aún poco usada en pacientes jóvenes. Objetivo: Analizar la utilidad y seguridad de la anestesia regional en pacientes menores de 20 años operados en la Fundación Oftalmológica Los Andes. Método: Revisión retrospectiva de 45 cirugías vitreorretinales y 27 cirugías de polo anterior, en menores de 20 años, realizadas con anestesia regional en nuestro servicio entre los años 2002 al 2004. Resultados: La edad fluctuó entre 12 y 20 años. No se reportaron complicaciones anestésicas intraoperatorias serias y en todos los casos se realizó el procedimiento sin inconvenientes, tanto para el cirujano como para el paciente. Los requerimientos de sedación fueron mayores en los pacientes sometidos a cirugía vitreorretinal (p<0,05). No hubo casos de conversión a anestesia general. Conclusión: La anestesia regional es una alternativa segura y bien tolerada, aún en cirugía vitreorretinal compleja.

Self retaining contact lens system for vitreous surgery.

We describe the principle and desiign of a new self-retaining contact lens system for vitreous surgery. The system has three lenses: theplano-concave, prism and magnifying lens. This system is based on the principle of a direct imaging contact lens, designed for a 150-200mm focal length operating micrcroscope. The contact lenses are designed to have an inferior concave surface [radius of curvature (ROC) 7.7mm], modified by theaddition of four footplates to provide stability and centration during vitreous surgery. The lenses are used with a drop of viscoelastic material placed between the concave surface of the contact lens and cornea. This induces negative suction and helps retain the lens in position during surgery. These specially designed lenses provide a stable, well-centered, high-resolution, magnified view of the fundus. This system eliminates the need for a skilled assistant or for suturing the lens to the sclera during vitreous surgery.