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A design of refractometer based on blur circle / 中国医疗器械杂志
Artigo em Chinês | WPRIM (Pacífico Ocidental) | ID: wpr-330508
Biblioteca responsável: WPRO
ABSTRACT
<p><b>OBJECTIVE</b>Design a convenient and stable eye refractometer based on the theory of blur circle.</p><p><b>METHODS</b>Analyze the retinal blur circle in both Emsly reduced eye model and Liou & Brennan 1997 eye model by ZEMAX. Design the coefficients including PD (pupil diameter) and NO' (length between node point and fovea) with the purpose of improving the accuracy. At last, compare the clinical optometry data from this refractor with the data obtained from optometry hospital in Wenzhou.</p><p><b>RESULTS</b>The blur circle diameters are nearly the same in both reduced eye model and the Liou & Brennan 1997 eye model. With the PD = 4 mm and NO' = 20 mm, the refractor shows a fine accuracy in optometry. The paired t test shows that the myopia group and the astigmatism axial direction group have no statistical difference between the data from the blur circle refractor and the hospital (P > 0.05), while the astigmatism degree group has the result of P = 0.41 which may be caused by the poor cooperation of pediatric patients. 80% of the astigmatism degree data differ from the data from the hospital in less than 0.75D.</p><p><b>CONCLUSION</b>The blur circle refractor, with the features of convenience and fine accuracy, is promised to be a new style of refractometer in the future.</p>
Assuntos
Texto completo: Disponível Base de dados: WPRIM (Pacífico Ocidental) Assunto principal: Oftalmoscopia / Refração Ocular / Astigmatismo / Acuidade Visual / Modelos Estatísticos / Oftalmoscópios / Desenho de Equipamento / Fóvea Central / Miopia Tipo de estudo: Fatores de risco Limite: Humanos Idioma: Chinês Revista: Chinese Journal of Medical Instrumentation Ano de publicação: 2011 Tipo de documento: Artigo
Texto completo: Disponível Base de dados: WPRIM (Pacífico Ocidental) Assunto principal: Oftalmoscopia / Refração Ocular / Astigmatismo / Acuidade Visual / Modelos Estatísticos / Oftalmoscópios / Desenho de Equipamento / Fóvea Central / Miopia Tipo de estudo: Fatores de risco Limite: Humanos Idioma: Chinês Revista: Chinese Journal of Medical Instrumentation Ano de publicação: 2011 Tipo de documento: Artigo
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