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Abstract(s)
Introdução: A Diabetes Mellitus é uma doença crónica e metabólica que provoca danos em vários órgãos inclusive no olho. Devido a isso, é comum os pacientes diabéticos apresentarem queixas de déficit visual. Este pode estar associado a um incremento de espalhamento intraocular induzido em parte pelas alterações biométricas provocadas pela diabetes na córnea e no cristalino.
Objetivo: Avaliar a influência da diabetes tipo 2 na qualidade da imagem retiniana através da medição do espalhamento intraocular e da avaliação da sua correlação com as alterações biométricas da córnea e do cristalino provocadas por esta patologia.
Métodos: Estudo caso-controlo em que a amostra de estudo é portadora de diabetes tipo 2 e constituída por 54 pacientes (62,7± 7,2 anos) e a amostra de controlo constituída por 27 pacientes (64,6 ± 7,1 anos). Ambos os grupos realizaram as medições de espalhamento intraocular com o método de compensação-comparação (C-Quant), a medição da espessura e do retroespalhamento da córnea com a câmara de Scheimpflug (Pentacam HR). Foram ainda medidas as espessuras centrais da córnea e do cristalino com o biómetro de coerência ótica (Lenstar LS900). Estas medições foram apenas realizadas ao olho direito.
Resultados: Observou-se um ligeiro aumento de espalhamento intraocular no grupo diabético (+0,043 log(s)), contudo sem significância estatística (p=0,430). Não se observaram diferenças significativas na biometria ocular de pacientes diabéticos comparativamente a pacientes controlo. No entanto, observou-se nos pacientes diabéticos uma correlação positiva fraca entre o espalhamento intraocular e a espessura da córnea quando esta era medida com o biómetro (r=0,281, p= 0,039). Apenas se verificou uma correlação positiva entre o EIO e a PIO (r= 0,298; p= 0,038) não se verificando nos restantes fatores de risco (duração da diabetes, índice de massa corporal e o nível de hemoglobina glicada). Relativamente ao retroespalhamento, não se verificaram alterações estatisticamente significativas entre os grupos (p= 0,678) nem uma correlação significativa com o espalhamento intraocular (r=0,017, p= 0,901).
Conclusões: Em relação ao grupo de controlo os pacientes diabéticos não apresentaram aumentos significativos de espalhamento intraocular. As variáveis biométricas encontram-se dentro dos valores normais, não havendo assim fontes de incremento de espalhamento intraocular.
Introduction: Diabetes Mellitus is a chronic and metabolic disease that causes damage to several organs including the eye. Because of this, it is common for diabetic patients to present complaints of visual defect. This may be associated with an increase in intraocular straylight partly induced by the biometric changes in the cornea and crystalline lens by this pathology. Objective: To evaluate the influence of type 2 diabetes on the quality of retinal image by measuring the intraocular straylight and the evaluation of its correlation with the biometric changes on the cornea and the lens caused by this pathology. Methods: A case-control study in which the study sample carries 54 type 2 diabetic patients (62,7± 7,2 years) and the control sample carries 27 control patients (64,6±7,1 years). Both groups performed strayligh measurements with the method comparasion-compensation (C-Quant), measurement of corneal thickness and backscattering with a Scheimpflug camera (Pentacam HR). The central thickness of the cornea and lens were also measured with a optical coherence biometer (Lenstar LS900). These measurements were only performed on the right eye. Results: A slight increase in straylight was observed in the diabetic group (+0,043 log(s)), however with no statistical significance (p=0,430). There were no significant differences in ocular biometry of diabetic patients compared to control patients. However, a weak positive correlation between straylight and corneal thickness was observed in diabetic patients when measured with the biometer (r= 0,281; p= 0,039). There was only a positive correlation between straylight and intraocular pressure (r= 0,298; p= 0,038) and did not occur with the remaining risk factos (duration of DM, body mass índex, and HbA1c level). Regarding backscatter, there were no significant changes between the groups (p = 0.678) nor a significant correlation with intraocular scattering (r = 0.017, p = 0.901). Conclusions: In relation to the control group, diabetic patients did not present significant increase in straylight. The biometric variables are within the normal values, therefore there are no sources of increase of straylight.
Introduction: Diabetes Mellitus is a chronic and metabolic disease that causes damage to several organs including the eye. Because of this, it is common for diabetic patients to present complaints of visual defect. This may be associated with an increase in intraocular straylight partly induced by the biometric changes in the cornea and crystalline lens by this pathology. Objective: To evaluate the influence of type 2 diabetes on the quality of retinal image by measuring the intraocular straylight and the evaluation of its correlation with the biometric changes on the cornea and the lens caused by this pathology. Methods: A case-control study in which the study sample carries 54 type 2 diabetic patients (62,7± 7,2 years) and the control sample carries 27 control patients (64,6±7,1 years). Both groups performed strayligh measurements with the method comparasion-compensation (C-Quant), measurement of corneal thickness and backscattering with a Scheimpflug camera (Pentacam HR). The central thickness of the cornea and lens were also measured with a optical coherence biometer (Lenstar LS900). These measurements were only performed on the right eye. Results: A slight increase in straylight was observed in the diabetic group (+0,043 log(s)), however with no statistical significance (p=0,430). There were no significant differences in ocular biometry of diabetic patients compared to control patients. However, a weak positive correlation between straylight and corneal thickness was observed in diabetic patients when measured with the biometer (r= 0,281; p= 0,039). There was only a positive correlation between straylight and intraocular pressure (r= 0,298; p= 0,038) and did not occur with the remaining risk factos (duration of DM, body mass índex, and HbA1c level). Regarding backscatter, there were no significant changes between the groups (p = 0.678) nor a significant correlation with intraocular scattering (r = 0.017, p = 0.901). Conclusions: In relation to the control group, diabetic patients did not present significant increase in straylight. The biometric variables are within the normal values, therefore there are no sources of increase of straylight.
Description
Keywords
Alterações Biométricas Diabetes Mellitus Tipo II Espalhamento Intraocular Qualidade Visual