SAMIR JACOB BECHARA
Projetos de Pesquisa
Unidades Organizacionais
LIM/33 - Laboratório de Oftalmologia, Hospital das Clínicas, Faculdade de Medicina
16 resultados
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Agora exibindo 1 - 10 de 16
- Intraocular straylight before and after low myopic photorefractive keratectomy with and without mitomycin C(2016) TORRICELLI, Andre Augusto Miranda; PAREDE, Tais Renata Ribeiro; NETTO, Marcelo Vieira; CRESTANA, Francisco Penteado; BECHARA, Samir JacobPurpose: To evaluate ocular straylight before and after photorefractive keratectomy (PRK) for low myopia with and without topical mitomycin (MMC) treatment. Methods: Patients who underwent PRK for low myopia were enrolled into the study. PRK without MMC was performed in 21 eyes (12 patients), whereas PRK with topical 0.02% MMC was performed in 25 eyes (14 patients). Both groups were treated using the NIDEK EC5000 excimer laser. Measurements were performed using the C-Quant straylight meter preoperatively and at two and four months postoperatively. Results: The mean patient age was 30 +/- 4 years, and the mean spherical equivalent refractive error was -2.2 +/- 0.75 D. The mean preoperative intraocular straylight values were 1.07 +/- 0.10 in the PRK without MMC group and 1.07 +/- 0.11 log(s) in the PRK with topical MMC group. At two months after surgery, there was a decrease in mean intraocular straylight values in both groups. However, a significant difference was only reached in the PRK with MMC group [0.98 +/- 0.09 log(s), p=0.002] compared with preoperative values, which was likely due to a greater scatter of measurements in the PRK without MMC group [1.03 +/- 0.13 log(s), p=0.082]. At four months postoperatively, ocular straylight values were not significantly different compared with those at baseline in either the PRK without MMC group [1.02 +/- 0.14 log(s), p=0.26] or in the PRK with topical MMC group [1.02 +/- 0.11 log(s), p=0.13]. Conclusion: PRK for low myopia decreases ocular straylight, and MMC application further reduces straylight in the early postoperative period. However, ocular straylight values do not significantly differ at four months after surgery compared with those at baseline.
article 9 Citação(ões) na Scopus Predictors of Early Postoperative Pain After Photorefractive Keratectomy(2016) GARCIA, Renato; TORRICELLI, Andre Augusto Miranda; MUKAI, Adriana; PEREIRA, Vinicius Borges Porfirio; BECHARA, Samir JacobPurpose: To compare the profiles of postoperative photorefractive keratectomy (PRK) pain between both eyes under the same conditions and to verify the preoperative predictors of pain such as gender, anxiety, knowledge of the procedure, and spherical equivalent refractive error (SERE). Methods: This prospective study included 86 eyes of 43 patients with myopia who underwent PRK in both eyes at an interval of 14 days between the procedures. Before surgery, subjects answered the State Anxiety Inventory. After surgery, usual PRK pain treatment was given. Subjects answered the Visual Analog Scale, the Brief Pain Inventory (BPI), and the McGill Pain Questionnaire at 1, 24, 48, 72, and 96 hours after surgery. Pain scores and anxiety were compared between each eye using the Wald test and paired Student t test, respectively. The Wald test was performed for gender and SERE for each eye separately. Results: There were no statistically significant differences between both eyes for all time points regarding the Visual Analog Scale, BPI, and McGill Pain Questionnaire Pain Rating Index pain scores. Subjects were less anxious on average before the second surgery compared with before the first surgery (P < 0.001); however, it was not related to pain ratings after surgery. Gender did not significantly affect any scale of pain, and the SERE between 3 diopters (D) and 5 D (P = 0.035) revealed effects on the BPI. Conclusions: The profiles of postoperative pain after PRK were similar between both eyes under the same conditions. In this study, a high SERE was the only predictor for increased pain after PRK.- Quality of vision in refractive and cataract surgery, indirect measurers: review article(2013) PAREDE, Tais Renata Ribeira; TORRICELLI, Andre Augusto Miranda; MUKAI, Adriana; NETTO, Marcelo Vieira; BECHARA, Samir JacobVisual acuity is the measurement of an individual's ability to recognize details of an object in a space. Visual function measurements in clinical ophthalmology are limited by factors such as maximum contrast and so it might not adequately reflect the real vision conditions at that moment as well as the subjective aspects of the world perception by the patient. The objective of a successful vision-restoring surgery lies not only in gaining visual acuity lines, but also in vision quality. Therefore, refractive and cataract surgeries have the responsibility of achieving quality results. It is difficult to define quality of vision by a single parameter, and the main functional-vision tests are: contrast sensitivity, disability glare, intraocular stray light and aberrometry. In the current review the different components of the visual function are explained and the several available methods to assess the vision quality are described.
bookPart Seleção do paciente, perfil psicológico e aspectos legais em cirurgia refrativa(2022) BECHARA, Samir Jacob- Longitudinal measurements of luminance and chromatic contrast sensitivity: comparison between wavefront-guided LASIK and contralateral PRK for myopia(2013) BARBONI, Mirella Telles Salgueiro; FEITOSA-SANTANA, Claudia; BARRETO JUNIOR, Jackson; LAGO, Marcos; BECHARA, Samir Jacob; ALVES, Milton Ruiz; VENTURA, Dora FixPURPOSE: The present study aimed to compare the postoperative contrast sensitivity functions between wavefront-guided LASIK eyes and their contralateral wavefront-guided PRK eyes. METHODS: The participants were 11 healthy subjects (mean age=32.4 ± 6.2 years) who had myopic astigmatism. The spatial contrast sensitivity functions were measured before and three times after the surgery. Psycho and a Cambridge graphic board (VSG 2/4) were used to measure luminance, red-green, and blue-yellow spatial contrast sensitivity functions (from 0.85 to 13.1 cycles/degree). Longitudinal analysis and comparison between surgeries were performed. RESULTS: There was no significant contrast sensitivity change during the one-year follow-up measurements neither for LASIK nor for PRK eyes. The comparison between procedures showed no differences at 12 months postoperative. CONCLUSIONS: The present data showed similar contrast sensitivities during one-year follow-up of wave-front guided refractive surgeries. Moreover, one year postoperative data showed no differences in the effects of either wavefront-guided LASIK or wavefront-guided PRK on the luminance and chromatic spatial contrast sensitivity functions.
- Pediatric keratoconus epidemiology: a systematic scoping review(2024) HANSEN, Lucca Ortolan; GARCIA, Renato; CRESTA, Fernando Betty; TORRICELLI, Andre Augusto Miranda; BECHARA, Samir JacobBackgroundPediatric keratoconus (pediatric KC) causes progressive deformation of the cornea in children and adolescents, leading to a gradual loss of vision and a need for rehabilitation. However, new treatments may halt the disease and prevent worse outcomes that require penetrating keratoplasty and its associated morbidity and high cost, irreversible loss of vision, and amblyopia. Few systematic reviews focus on keratoconus-and even fewer, on pediatric KC.MethodsHere, we report a systematic scoping review of pediatric KC epidemiology and discuss the studies reporting data on pediatric KC. We used PRISMA-ScR methodology and checklists in the elaboration of the manuscript. The inclusion criteria were: English language; publication between August 7, 1998, and August 7, 2019 (20 years); theme of the study pediatric KC epidemiology. The search strategy: searches of the PubMed-MEDLINE database and Cochrane Database of Systematic Reviews, using eight combinations of the following MeSH terms: keratoconus; child; incidence; prevalence; pediatrics; adolescent; epidemiology.ResultsWe charted and reviewed the selected articles. Initial searches included 1802 records; after the exclusion of article duplicates, we screened 777 records, read 97 articles in full text, and included 76 articles in this review.ConclusionsRecent epidemiological studies with better methodologies demonstrated increased prevalence rates in comparison to the older literature. This effect may be due to better diagnostic methods and better sample selection than those in historical studies. Diagnosis remains a major challenge as the early disease is usually asymptomatic. Economic and social aspects of pediatric KC remain understudied in the pediatric literature. Global, inclusive, and proactive screening studies in schools are imperative to better understand the great impact of this disease in the young.
- LASIK hipermetrópico pós-DSAEK (Descement Stripping Automated Endotelial Keratoplasty)(2016) MEIRELES, Antonio Carlos Manhas; BECHARA, Samir Jacob; MARTINES, EduardoABSTRACT DSAEK (Descemet stripping automated endothelial keratoplasty) is one of the options for corneal endothelium disease, which in some patients can result in a residual hyperopia after the procedure. Usually 6 to 12 months after corneal transplantation refraction is already stable. This report describes a therapeutic option used in a 54 years old patient with Fuchs' endothelial dystrophy submitted to cataract and corneal transplant that resulted in residual hyperopia, three years after the procedure the best corrected vision was 20/20 with a refraction of +3.25 -1.00 (5 º) treated with Hyperopic - LASIK (Laser-assisted In Situ Keratomileusis) with satisfactory visual result.
bookPart Infecções Orbitárias(2013) GARCIA, Renato; LUNARDELLI, Patrícia; BECHARA, Samir Jacob- Improved Evaluation of Postoperative Pain After Photorefractive Keratectomy(2016) GARCIA, Renato; HOROVITZ, Roberto Novaes Campello; TORRICELLI, Andre Augusto Miranda; MUKAI, Adriana; BECHARA, Samir JacobPurpose:Postoperative pain remains an important limiting factor to the selection of photorefractive keratectomy (PRK). There is a consensus in neurology pain research that pain should be evaluated as a multidimensional concept, which differs from current practice in ophthalmology. The purpose of this paper was to validate the use of multidimensional questionnaires, such as the Brief Pain Inventory (BPI) and the McGill Pain Questionnaire (MPQ), to provide an improved analysis of pain after PRK and to better describe its temporal profile.Methods:This prospective study included 43 eyes of 43 myopic patients who underwent unilateral PRK. After surgery, usual pain treatment was administered. All of the participants responded to the Visual Analogue Scale (VAS), the BPI and the MPQ 1, 24, 48, 72, and 96 hours after surgery. The internal consistency was evaluated, different postoperative periods were compared, and convergent validity was assessed using correlation testing.Results:The Cronbach alpha test showed high internal consistency for each of the questionnaire subscales. Patients reported higher postoperative pain values at the first measurement of the VAS (4.93 2.38), MPQ-pain rating index (26.95 +/- 10.58), BPI-pain severity index (14.53 +/- 7.36), and BPI-pain interference index (22.30 +/- 15.13). Almost all of the scales and subscales showed a statistically significant direct correlation with the VAS at all of the evaluation periods.Conclusions:This study validated the utility of multidimensional questionnaires to expand the assessment of the PRK postoperative pain profile, including intensity and other qualitative aspects.
bookPart Olho Vermelho e Dor Ocular(2013) TORRICELLI, André A.M.; GARCIA, Renato; BECHARA, Samir Jacob