نتایج جستجو برای: refractive error correction
تعداد نتایج: 406131 فیلتر نتایج به سال:
Understanding peripheral optical errors and their impact on vision is important for various applications, e.g. research on myopia development and optical correction of patients with central visual field loss. In this study, we investigated whether correction of higher order aberrations with adaptive optics (AO) improve resolution beyond what is achieved with best peripheral refractive correctio...
PURPOSE To assess the intraocular pressure (IOP) and its association in children in a population living in an oasis in the Gobi Desert. METHODS The cross-sectional school-based study included all schools in the Ejina region. The children underwent an ophthalmic examination, non-contact tonometry and measurement of blood pressure and body height and weight. RESULTS Out of eligible 1911 child...
This study aimed at investigating the effects of grammatical error correction on EFL learners’ accuracy. Twenty-two male and female senior students were chosen randomly to respond to a questionnaire investigating their beliefs about immediate grammatical error correction. Actually, the study was conducted in order to answer this question: what is the effect of grammatical error feedback on stu...
PURPOSE To compare the proportions of school children with myopia and impaired visual acuity in Greece and Bulgaria. METHODS A sample of 898 children, aged 10-15 years, was selected from two primary and two secondary schools in a Greek city (Heraklion), and one primary and secondary school in a Bulgarian city (Stara Zagora). Five hundred and eighty eight children were Greek (65.5%, mean age 1...
Point-like nature of stars leads to significant disturbances of light beams passed through the atmosphere by refractive effects. These effects should be taken into account in retrievals from stellar occultation measurements. We consider the influence of scintillation on stellar occultation measurements and on quality of ozone retrievals from these measurements, based on experience of the GOMOS ...
In this paper, convergence rate of digital error correction algorithm in correction of capacitor mismatch error and finite and nonlinear gain of Op-Amp has increased significantly by the use of DLMS, an evolutionary search algorithm. To this end, a 16-bit pipelined analog to digital converter was modeled. The obtained digital model is a FIR filter with 16 adjustable weights. To adjust weights o...
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