Expediency of the Automated Perimetry Using the Goldmann V Stimulus Size in Visually Impaired Patients with Glaucoma.

INTRODUCTION: White-on-white standard automated perimetry (AP) uses a white round stimulus with 0.43° diameter and 4.0 mm2 area (Goldmann size III). Patients with low vision have difficulty seeing such a small stimulus and are often tested with perimetry using the size V stimulus with 1.72° diameter and 64 mm2 area. We undertook an observational case-control study to compare the performance of patients on AP using two differently sized stimuli. METHODS: Patients with glaucoma and visual acuity worse than 20/100 underwent AP using the standard size III stimulus Swedish Interactive Threshold Algorithm (SITA) standard test and size V stimulus full threshold test. All patients were familiar with the procedure, having done the test at least twice previously. Another group of glaucoma patients with visual acuity better than 20/40 served as controls. The main outcome measures included test time, mean retinal sensitivity (MRS), foveal sensitivity (FS), fixation loss (FL), false positive (FP), false negative (FN), and the patient's subjective preference. RESULTS: Fifty patients were included in the study. Most preferred the size V stimulus target size test. For glaucoma patients, test time was shorter with size III; MRS and FS were higher with size V; FL, FP, and FN did not differ between the tests. CONCLUSION: AP with stimulus size V may be a good alternative to standard size III in selected visually debilitated patients who report difficulty undergoing a standard SITA 24-2 test.

Correlation between the ganglion cell complex and functional measures in glaucoma patients and suspects.

The purpose of the study was to correlate the Fourier-domain OCT ganglion cell complex (GCC) parameters with automated perimetry (AP) functional measures of the optic nerve. This retrospective study included patients who had previously undergone examination with the RTVue-100 OCT and AP, SITA strategy. The parameters of GCC (average, superior, inferior, S-I [superior inferior difference], S-I SD [standard deviation of S-I], GLV [global loss volume] and FLV [focal loss volume]) were correlated with the mean deviation (MD) and pattern standard deviation (PSD) values of AP using linear and logarithmic regression analysis. All correlations between GCC and automated perimetry parameters were strong (r > 0.60), except that for SI and MD (r = -0.05); SI and PSD (r = 0.09); SI-DS and MD (r = -0.06); and SI-SD and PSD (r = 0.08). In summary, GCC derived structural measures showed good correlation with functional parameters from AP.

Correlation between the ganglion cell complex and structural measures of the optic disc and retinal nerve fiber layer in glaucoma.

To correlate the ganglion cell complex (GCC) parameters with structural measures of the optic nerve head (ONH) and retinal nerve fiber layer (RNFL) as evaluated by Fourier-Domain optic coherence tomography (OCT). This retrospective study included patients with glaucoma, ocular hypertensive patients and glaucoma suspects who had previously undergone OCT examination with the RTVue-100. The parameters of GCC (average, superior, inferior, focal loss volume [FLV], global loss volume [GLV]) were correlated with the values of the ONH (cup volume, cup area, horizontal cup-to-disk ratio, vertical cup-to-disk ratio, and rim area) and RNFL (average, superior, and inferior) using Pearson's correlation coefficient. The sample included 74 eyes of 37 patients. All correlations between GCC parameters and RNFL were strong (r > 0.60). The correlation between GCC parameters and ONH were good for most parameters, except that for FLV and cup volume (r = 0.13), GLV and cup volume (r = 0.09), and GLV and cup area (r = 0.21). The GCC parameters can be used as structural measures of the glaucomatous optic neuropathy.

Myocilin mt.1 gene promoter single nucleotide polymorphism (-1000C>G) in Brazilian patients with primary open angle glaucoma.

BACKGROUND: The myocilin (MYOC) gene promoter polymorphism -1000C>G (MYOC mt.1) can be associated with faster progression of primary open angle glaucoma (POAG). The purpose of this study was to investigate the MYOC mt.1 in Brazilian patients with POAG and to evaluate its possible role on the phenotype and the severity of the disease. MATERIAL AND METHODS: One hundred sixty-seven POAG patients and 130 normal controls were enrolled. DNA samples were prepared and the MYOC mt.1 polymorphism was screened by real-time polymerase chain reaction (RT-PCR) in an Single-nucleotide polymorphism (SNP) assay. Frequencies of the MYOC mt.1 promoter polymorphism were determined for both groups and compared by Fisher's exact test and Chi-square test with Yate's correction. Intraocular pressure (IOP), cup-to-disc ratio (C/D), number of glaucoma medications, and number of glaucoma surgeries were compared between MYOC mt.1 carriers and non-carriers. RESULTS: MYOC mt.1 genotype frequencies did not differ between POAG and controls (P = 0.420); 14.6% of controls and 16.4% of POAG patients were MYOC mt.1 carriers (CG or GG). Frequencies of the G allele were similar between glaucomatous patients and controls (7.3% and 9.2%, respectively; P = 0.477). Among POAG patients, there were no differences in mean C/D ratio, IOP, number of glaucoma medications, and surgical procedures for IOP control between carries and non-carriers of the MYOC mt.1 promoter polymorphism (p>0.05). CONCLUSION: The G allele of the MYOC mt.1 promoter polymorphism was equally distributed among POAG patients and healthy subjects and it is possibly unrelated to the risk and severity of disease in the Brazilian population.

Lack of association between optineurin gene variants T34T, E50K, M98K, 691_692insAG and R545Q and primary open angle glaucoma in Brazilian patients.

PURPOSE: To verify the frequencies of T34T, E50K, M98K, 691_692insAG, and R545Q variants in the optineurin (OPTN) gene in Brazilian subjects with primary open-angle glaucoma (POAG) and controls. PATIENTS AND METHODS: Ninety-nine patients with POAG and 100 normal controls were enrolled in this study. The frequency of alterations in the OPTN gene was analyzed by direct sequencing and enzymatic digestion of PCR products. RESULTS: None of the five alterations evaluated was significantly associated with POAG when compared to controls. However, the T34T silent change was present in greater frequency in POAG patients (37.37% vs. 23.00% in controls), while the R545Q change was more prevalent in controls (23.00% vs. 10.10% in POAG). The M98K and 691_692insAG presented with low frequencies in POAG patients (1.01% and 2.02%, respectively) and controls (2.00% and 2.00%, respectively). The E50K substitution was not observed. CONCLUSION: Our data show no association between the five evaluated variants and POAG in the Brazilian population.

Use of amniotic membrane in trabeculectomy for the treatment of glaucoma: a pilot study.

PURPOSE: To compare the safety and efficacy of human preserved amniotic membrane (AM) in the trabeculectomy for treatment of primary open-angle glaucoma. METHODS: A prospective, randomized clinical trial compared primary trabeculectomy with amniotic membrane (study group) and without amniotic membrane (control group) in the treatment of the glaucoma. Intraocular pressure (IOP), number of glaucoma medications and appearance of the bleb were compared between the two groups. Thirty-two patients divided into two groups of 16 patients were followed for a period of 12 months. RESULTS: The difference of the mean postoperative intraocular pressure between groups was not statistically significant (15.19 +/- 3.33 in the control group and 12.81 +/- 2.48 in the study group p=0.297) at one year follow-up. Postoperative number of medications decreased in both groups (p<0.001 and p=0.007, study group and control respectively). At the end of a 12-month follow-up period, nine eyes (56.25%) showed thin, avascular blebs in the study group as compared to only one eye (6.25%) in the control group. CONCLUSIONS: Trabeculectomy with amniotic membrane and standard trabeculectomy promote lower postoperative intraocular pressure although results showed no statistically significant difference between groups regarding postoperative intraocular pressure after one year follow-up.

Use of amniotic membrane in trabeculectomy for the treatment of glaucoma: a pilot study

OBJETIVO: Comparar a eficácia e a segurança do uso da membrana amniótica (MA) na trabeculectomia para o tratamento cirúrgico do glaucoma primário de ângulo aberto. MÉTODOS: Estudo prospectivo aberto, randomizado, grupos paralelos de tratamento. Trinta e dois pacientes com indicação de tratamento cirúrgico para glaucoma foram selecionados e aleatoriamente divididos em dois grupos. O primeiro grupo foi submetido a trabeculectomia com o uso intra-operatório da membrana amniótica (grupo estudo) e o segundo grupo foi submetido a trabeculectomia sem o uso da membrana amniótica (grupo controle) comparando o efeito redutor da pressão intra-ocular, número de medicações e aparência da bolha filtrante. Trinta e dois pacientes divididos em dois grupos de 16 pacientes foram acompanhados por 12 meses. RESULTADOS: A média das pressões pós-operatórias no grupo da membrana amniótica 12,81± 2,48 e no grupo controle 15,19±3,33 não apresentaram diferença estatisticamente significante no seguimento de um ano (p=0,297). O número de medicações pós-operatórias diminuiu nos dois grupos (p<0,001 e p=0,007 grupo estudo e grupo controle respectivamente). No final de 12 meses de pós-operatório nove olhos (56,25%) apresentaram bolhas finas e avasculares no grupo estudo comparando com apenas um olho (6,25%) do grupo controle. CONCLUSÃO: A trabeculectomia com membrana amniótica e a trabeculectomia simples mostraram redução da pressão intra-ocular no pós-operatório, embora a diferença entre elas não seja estatisticamente significante.

[The role of frequency doubling perimetry in the diagnosis of glaucoma: screening in employees of a public hospital in an urban area of São Paulo]. / Importância da perimetria de dupla freqüência na detecção do glaucoma: rastreamento em funcionários de hospital público numa área urbana de São Paulo.

PURPOSE: To study the prevalence of glaucoma in employees of a public hospital in São Paulo and to analyze the role of frequency doubling perimetry along with non-contact tonometry and direct ophthalmoscopy, in the screening for glaucoma. METHODS: 612 employees of the Central Hospital of the "Santa Casa de São Paulo" were evaluated from October 15 to 20, 2000; 438 were women and 174 men, with mean age of 45.05+/-7.7 years (range, 35 to 81 years); 437 were white, 104 mulatto, 43 black and 28 Asian. All examinations were done by 10 eye specialists with experience in glaucoma. All employees had both eyes examined, by means of frequency doubling perimetry (FDT), ophthalmoscopy (FO), and non-contact tonometry (TNC). RESULTS: 159 (25.98%) subjects presented with at least one abnormal testing; 5 (3.14%) had high IOP (TNC+); 13 (8.17%) presented suspicious disk (FO+); 110 (69.18%) presented abnormal FDT (FDP+); 8 (5.03%) TNC+ and FO+; 10 (6.28%) had TNC+ and FDT+; 9 (5.66%) presented FO+ and FDT+; 4 (2.51%) had TNC+, FO+ and FDT+; 12 (1.96%) individuals were diagnosed with glaucoma, four of whom (0.65%), with normal pressure glaucoma. CONCLUSIONS: Frequency doubling perimetry was found to be an important step in the screening for glaucoma in the study. Of the 12 individuals that had the diagnosis of glaucoma, 5 (41.6%) would not have been diagnosed if they had not undergone frequency doubling perimetry.

Importância da perimetria de dupla freqüência na detecção do glaucoma: rastreamento em funcionários de hospital público numa área urbana de São Paulo / The role of frequency doubling perimetry in the diagnosis of glaucoma: screening in employees of a public hospital in an urban area of São Paulo

OBJETIVO: Estudar a prevalência de glaucoma, em funcionários da Santa Casa de Misericórdia de São Paulo e analisar a validade da inclusão da perimetria de freqüência dupla junto à tonometria de não-contato e à oftalmoscopia direta, na triagem para glaucoma. MÉTODOS: Foram examinados 612 funcionários voluntários, 438 mulheres e 174 homens, com idade média de 45,05±7,7 anos. Eram 437 da raça branca, 104 mulatos, 43 da raça negra e 28 da raça amarela. Todos os funcionários tiveram ambos os olhos examinados por especialistas em glaucoma, que realizaram os seguintes exames: perimetria de freqüência dupla (FDT), oftalmoscopia direta (FO), tonometria de não-contato (TNC). RESULTADOS: Dos 612 indivíduos triados, 159 (25,98 por cento) apresentaram alguma anormalidade em pelo menos um dos exames: 5 (3,14 por cento) apresentaram pressão intra-ocular elevada (TNC+); 13 (8,17 por cento) apresentaram oftalmoscopia suspeita (FO+); 110 (69,18 por cento) apresentaram perimetria de freqüência dupla alterado (FDT+); 8 (5,03 por cento) TNC+ e FO+; 10 (6,28 por cento) TNC+ e FDT+; 9 (5,66 por cento) FO+ e FDT+; 4 (2,51 por cento) TNC+, FO+ e FDT+. Foram detectados 12 (1,96 por cento) indivíduos com glaucoma, quatro dos quais (0,65 por cento) com glaucoma de pressão normal. CONCLUSÕES: A perimetria de freqüência dupla mostrou-se útil para o rastreamento de glaucoma dentro da amostragem estudada. Do total de 12 indivíduos que tiveram o diagnóstico de glaucoma, 5 (41,6 por cento) não teriam sido detectados se não tivessem sido submetidos a perimetria de freqüência dupla.

Comparação entre a correção cilíndrica total e o equivalente esférico na realização da perimetria computadorizada / Comparison between the full cylindrical correction and the spherical equivalent in the execution of automated perimetry

OBJETIVO: Verificar a existência de diferença estatisticamente significativa entre exames de campimetria computadorizada, realizados com a utilização da correção total e do equivalente esférico, em pacientes com ametropia cilíndrica de valores iguais ou maiores que 1,50 dioptrias. MÉTODOS: Vinte pacientes (35 olhos) foram submetidos a exame de campo visual, perimetria computadorizada Humphrey - estratégia SITA 24-2, usando em um exame a correção total e em outro o equivalente esférico. Foram utilizados como parâmetros de comparação os valores de Mean Deviation, Pattern Standard Deviation, perdas de fixação, falso-positivos, falso-negativos e duração dos exames. RESULTADOS: Os parâmetros Mean Deviation, Standard Pattern Deviation, falso-positivos, falso-negativos e duração do exame não apresentaram diferença estatisticamente significativa. A perda de fixação foi maior no grupo usando correção cilíndrica total, dado estatisticamente significante. CONCLUSAO: Exames de campo visual realizados com equivalente esférico não mostram diferença na sensibilidade retínica quando comparados com o uso de correção cilíndrica total, dentro dos padrões adotados neste estudo.