Refractive Errors
Mostrando 13-24 de 49 artigos, teses e dissertações.
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13. Image Processing and Analysis for Measuring Ocular Refraction Errors / "Processamento e análise de imagens para medição de vícios de refração ocular"
This work presents a computational system that uses Machine Learning (ML) techniques to assist in ophthalmological diagnosis. The system developed produces objective and automatic measures of ocular refraction errors, namely astigmatism, hypermetropia and myopia from functional images of the human eye acquired with a technique known as Hartmann-Shack (HS), o
Publicado em: 2003
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14. Sistema de medidas automáticas de vícios de refração ocular. / Automatic measuring system of ocular refractive errors.
The purpose of the present work is the development of an objective and automatic system for ocular refractive errors measurements. Hence, a strong interaction between Physics and Ophthalmology was fundamentally important in order to provide the success of the work four systems have been developed, where three of them are completely different from each other
Publicado em: 1995
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15. ANALYSIS OF THE CLASSICAL THEORIES OF PROPAGATION IN THE PRESENCE OF THE EARTH / ANÁLISE DAS TEORIAS CLÁSSICAS DE PROPAGAÇÃO DAS ONDAS RADIOELÉTRICAS EM PRESENÇA DA TERRA
In view of the mathematical complexity, the rigorous solutions of the classical theories of radio wave propagation in the presence of the earth are not directly applied to practical problems. Hence, based on these rigorous solutions, approximate expressions are developed to simplify the eveluation of radio wave signal attenuation. However, due to assumptions
Publicado em: 1966
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16. Refractive errors in patients with fundus flavimaculatus.
A total of 59 patients (118 eyes) with fundus flavimaculatus who had atrophic macular lesions were examined for refractive error. Myopic refractions of greater than -0.1 dioptre were seen in 12% of a normal population and in 76% of our patient population. The spherical equivalent refractive errors described a single-peaked skewed distribution with a mean of
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17. Screening for refractive errors in 6-9 month old infants by photorefraction.
The method of isotropic photorefraction has been used in a trial of refractive screening of 6-9 month old infants. Data are presented on the calibration of the method against retinoscopic measurements and its reliability. In photorefractive screening of 1096 infants under cyclopentolate cycloplegia 5% were found to be hypermetropic (over +3.5 D), 4.5% myopic
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18. Refractive errors of retinitis pigmentosa patients.
A retinitis pigmentosa (RP) population (268 eyes) had predominantly myopic refractive errors. Whereas 12% of a normal population have myopic refractions, myopia was found in 75% of 268 eyes of RP patients and in 95% of 41 eyes of X-linked RP patients. The spherical errors describe a single-peaked, skewed distribution, with a mean of -1.86 dioptres that is si
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19. Prevalence of refractive errors in adults over 40: a survey of 8102 eyes.
The prevalence of refractive errors was studied in an adult rural population. Of the 8102 eyes studied 18-4% were myopic, 57-1% were emmetropic, and 24-5% were hypermetropic. Mild myopia was commoner in males than in females, and mild hypermetropia was commoner in females than in males. There was increasing hypermetropia with increasing age, probably due to
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20. Astigmatic difference in refractive errors.
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21. Comparative study of refractive errors in West Malaysia.
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22. Refractive errors in neurofibromatosis type 1 and type 2
BMJ Group.
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23. THE RELATION OF EXOPHORIA IN EARLY PRESBYOPIA TO REFRACTIVE ERRORS*
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24. Correlations in refractive errors between siblings in the Singapore Cohort Study of Risk factors for Myopia
BMJ Group.