منابع مشابه
The influence of cycloplegia in objective refraction.
The purpose of this study was to compare refractions measured with an autorefractor and by retinoscopy with and without cycloplegia. The objective refractions were performed in 199 right eyes from 199 healthy young adults with a mean age of 21.6 +/- 2.66 years. The measurements were performed first without cycloplegia and repeated 30 min later with cycloplegia. Data were analysed using Fourier ...
متن کاملAccuracy and precision of objective refraction from wavefront aberrations.
We determined the accuracy and precision of 33 objective methods for predicting the results of conventional, sphero-cylindrical refraction from wavefront aberrations in a large population of 200 eyes. Accuracy for predicting defocus (as specified by the population mean error of prediction) varied from -0.50 D to +0.25 D across methods. Precision of these estimates (as specified by 95% limits of...
متن کاملestimation of vs profiling by joint inversion of refraction microtremor and seismic refraction data using ga multi-objective optimization approach
it is very important to study and simulate s-wave structure for near surface (alluvium parts, in particular) owing to its direct relationship to urban facilities in geotechnical and earthquake engineering studies. so, in seismic microzonation, the first step is to study and identify s-wave pattern in alluvium in order to categorize different parts of cites according to s-wave velocity. current ...
متن کاملThe Development of Modern Methods of Estimating Refraction.
THE use of lenses for the correction of refractive errors is of great antiquity, but it is only within the last hundred years that any real progress towards the exact correction of ametropia, can be said to have taken place. The honour of having made the first pair of lenses is possibly to be given to China. Bleached horn seems to have been the material chiefly in use there. Nero is said to hav...
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ژورنال
عنوان ژورنال: JAPANESE ORTHOPTIC JOURNAL
سال: 2003
ISSN: 1883-9215,0387-5172
DOI: 10.4263/jorthoptic.32.41