نتایج جستجو برای: eye optical problems
تعداد نتایج: 985284 فیلتر نتایج به سال:
Introduction: Eye discomforts and headache are prevalent among computer users. The aim of present study was to determine eye discomforts and headache associated with computer use among dormitory students of Tehran University of Medical Sciences. .Material and Method: In this cross – sectional study, data were collected using MIRTH (Musculo skeletal Injury Reduction Tools for Health and Safet...
Natural compound eyes combine small eye volumes with a large field of view at the cost of comparatively low spatial resolution. For small invertebrates such as flies or moths, compound eyes are the perfectly adapted solution to obtaining sufficient visual information about their environment without overloading their brains with the necessary image processing. However, to date little effort has ...
PURPOSE To determine whether optical coherence tomography (OCT) is a useful technique to monitor retinal damage and to evaluate the neuroprotective effect of topical tafluprost in a rat model of intravitreal endothelin-1 (ET-1) injection. METHODS A single intravitreal injection of ET-1 (0.2-200 pmol/eye) was performed in one eye. Optical coherence tomography imaging was performed until 2 week...
A 6-year-old patient was referred to our ophthalmology service because of an ocular deviation (esotropia) on the right eye for 3 years. Best-corrected visual acuity in right eye and 20/20 in left eye. According to the Krimsky test, the patient showed 15 prism dioptres esotropia in right eye. No changes were observed in biomicroscopy of both eyes and funduscopy of left eye was normal. An optical...
Myiasis of different organs has been reported from various regions in the world. Infection of the eye might appear as eyelids problems or conjunctiva (ophthalmomyiasis externa), or the larvae may invade into the eye (ophthalmomyiasis interna). We report 4 human cases of external ophthalmic myasis from Yazd province, in central region of Iran. All of them referred with symptoms of acute conjunct...
Evaluation of radiation absorption by thyroid gland and eye lens in trophy panoramic radiography Dr.AR. Talaee Pour *- Dr. S. Sahba ** - Dr. M. Maleknia***. *- Associate professor of Oral & Maxillofacial radiology Dept.- Faculty of Dentistry - Tehran University of Medical Sciences. ** - Associate professor of Oral Diseases and Diagnosis.- Faculty of Dentistry - Shaheed Beheshti University of Me...
In this report, we present a case of diabetic papillopathy that resolved after a single dose of intravitreal ranibizumab injection. A 50-year-old male presented with painless visual loss in his right eye. His visual acuity was 1/10 in the right eye and 10/10 in the left eye. Anterior segment examination of both eyes was unremarkable. Posterior segment of the right eye showed nonproliferative di...
A closed-form expression is derived for the optical transfer function of a diffraction-limited system under polychromatic illumination. The expression is useful in a method for the accurate and efficient computation of the optical transfer function of an optical system. The expression is also useful in the theoretical analyses of the optical system. This method is illustrated with an example wh...
Optical coherence tomography (OCT) and reflectance imaging are used in clinical practice to measure the thickness and transverse dimensions of retinal features. The recent trend towards increasing the field of view (FOV) of these devices has led to an increasing significance of the optical aberrations of both the human eye and the device. We report the design, manufacture and application of the...
In optical imaging experiments, it is often advantageous to map the field of view and to converge the eyes without electrophysiological recording. This occurs when limited space precludes placement of an electrode or in chronic optical chambers in which one may not want to introduce an electrode each session or for determining eye position in studies of ocular disparity response in visual corte...
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