نتایج جستجو برای: eye strain

تعداد نتایج: 373305  

Ebrahim Jafarzadeh Poor Keykhosro Keshavarzi, Maryam Abolmasoomi Mehran Nikkhou

Introduction: Until now, many models have been presented for optical study of the human eye. In recent years, surgery on the anterior section of the eye (such as cataract and photo-refractive surgery) has increased, so a study on the optics of the eye and evaluation of vision quality has become more important. Material and Methods: In this article, some of these models are considered. They incl...

2013
Vanessa Alphonse Andrew Kemper

Eye injuries affect approximately two million people annually. Various studies that have evaluated the injury tolerance of animal and human eyes from blunt impacts are summarized herein. These studies date from the late 60s to present and illustrate various methods for testing animal and human cadaver eyes exposed to various blunt projectiles including metal rods, BBs, baseballs, and foam piece...

Journal: :بینا 0
محمد زارع m zare تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم فیروز میربابایی قفقازی f mirbabaie تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم محمدعلی جوادی ma javadi تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم مژگان رضایی m rezaie تهران- پاسداران- بوستان نهم- بیمارستان لبافی نژاد- مرکز تحقیقات چشم

purpose: to evaluate bacterial and fungal contamination of donor corneas before and after decontamination at eye bank of i.r. of iran based on cultures. methods: this descriptive study was performed on 131 donor eyes (whole globe or cut cornea) used for corneal transplantation at labbafinejad hospital during a 6-month period. microbiologic culture was performed at three stages: before enucleati...

Journal: :journal of current ophthalmology 0
آرش معذوری arash mazouri سیدفرزاد محمدی s-farzad mohammadi نازنین رحمان nazanin rahman-a محمود جباروند mahmoud jabbarvand

purpose : round-the-clock on-demand availability and corneal cloudiness are the two major problems with animal eyes for surgical practice. the purpose of this investigation is to assess the usability of long-term deep freezing for the preservation of enucleated sheep eyes and the adjunctive role of intracameral cryoprotective agent on corneal clarity. methods : thirty-two enucleated fresh sheep...

Journal: :journal of lasers in medical sciences 0
seyyed abbas mirnezami iranian national center of laser science and technology mahdi rajaei jafarabadi iranian national center of laser science and technology maryam abrishami iranian national center of laser science and technology

introduction: human eye is a sensitive part of human body with no direct protection and due to its lack of protection against the external heat waves, studying the temperature distribution of heat waves on the human eye is of utmost importance. various lasers are widely used in medical applications such as eye surgeries. the most significant issue in the eye surgeries with laser is estimation o...

2015
Courtney Bricker-Anthony Tonia S. Rex

Damage to the eye from blast exposure can occur as a result of the overpressure air-wave (primary injury), flying debris (secondary injury), blunt force trauma (tertiary injury), and/or chemical/thermal burns (quaternary injury). In this study, we investigated damage in the contralateral eye after a blast directed at the ipsilateral eye in the C57Bl/6J and DBA/2J mouse. Assessments of ocular he...

2007
ANDREW D. GILBERT

This paper considers the evolution of smooth, two-dimensional vortices subject to a rotating external strain field, which generates regions of recirculating, cat’s eye stream line topology within a vortex. When the external strain field is smoothly switched off, the cat’s eyes may persist, or they may disappear as the vortex relaxes back to axisymmetry. A numerical study obtains criteria for th...

Journal: :E3S web of conferences 2021

The three-dimensional (3D) finite element model of human eye was established, and the intraocular pressure (IOP) loaded to simulate refractive surgery. biomechanical properties cornea after SMILE LASIK surgery were studied from stress, strain induced wavefront aberration. Our results showed that had less impact on biomechanics, having stress changes than LASIK. However, increased with increase ...

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