نتایج جستجو برای: postkeratoplasty astigmatism

تعداد نتایج: 3072  

Journal: :journal of comprehensive pediatrics 0
hassan hashemi noor ophthalmology research center, noor eye hospital, tehran, ir iranسازمان های دیگر: noor eye hospital soheila asgari department of epidemiology and biostatistics, school of public health, international campus, tehran university of medical sciences, tehran, ir iran abbas ali yekta department of optometry, mashhad university of medical sciences, mashhad, ir iran; department of optometry, mashhad university of medical sciences, mashhad, ir iran. tel: +21-88651515سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (tehran university of medical sciences) hadi ostadimoghaddam department of optometry, mashhad university of medical sciences, mashhad, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) batool haghighi department of optometry, mashhad university of medical sciences, mashhad, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences) sara soroush noor ophthalmology research center, noor eye hospital, tehran, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (mashhad university of medical sciences)

conclusions the prevalence of astigmatism was high in children under six years old in this study, and to control amblyopia, it is necessary to consider astigmatism at younger ages. results the prevalence of refractive astigmatism of more than 0.5d in at least one eye was 51.4% (95% confidence interval (ci): 50.7-52.1); 52.1% in girls and 50.7% in boys (p = 0.412). prevalence of astigmatism decr...

Journal: :Arquivos brasileiros de oftalmologia 2014
Bruna V Ventura Li Wang Mitchell P Weikert Shaun B Robinson Douglas D Koch

Correction of corneal astigmatism is a key element of cataract surgery, since post-surgical residual astigmatism can compromise the patient's uncorrected visual acuity. Toric intraocular lenses (IOLs) compensate for corneal astigmatism at the time of surgery, correcting ocular astigmatism. They are a predictable treatment. However, accurate measurement of corneal astigmatism is mandatory for ch...

خطیبیان, پژمان, سرخابی, رعنا, صدقی پور, محمدرضا,

Introduction & Objective: This study was performed to compare the visual and refractive outcomes of photorefractive keratectomy (PRK) in eyes with medium-high astigmatism by WF-guided method using Visx system and cross-cylinder method using Nidek EC-5000 excimer laser system.?Although there are many studies about efficacy and safety of Wave front guided and Cross Cylinder Photorefractive Kera...

Journal: :Vision Research 2002
Chea-su Kee Li-Fang Hung Ying Qiao Amro Habib Earl L. Smith

PURPOSE Human infants exhibit a high prevalence of astigmatism. Although macaque monkeys are commonly used as animal models in experiments on early ocular growth and emmetropization, the prevalence of astigmatism in infant monkeys is unexplored. In this study we examine the prevalence and nature of astigmatism in infant monkeys. METHODS Refractive and corneal astigmatism were measured in 132,...

2016
Edmund Arthur Ahmed Abdul Sadik David Ben Kumah Eugene Appenteng Osae Felix Agyemang Mireku Frank Yeboah Asiedu Reynolds Kwame Ablordeppey

The aim of the study was to report postoperative corneal and surgically induced astigmatism (SIA) in patients with preoperative against-the-rule (ATR) astigmatism who underwent superior approach manual small incision cataract surgery (MSICS). 58 eyes of 58 cataract patients with preoperative ATR astigmatism were involved in this study. All patients had operable cataracts and underwent superior ...

2015
Kazutaka Kamiya Kimiya Shimizu Mayumi Yamagishi Akihito Igarashi Hidenaga Kobashi

Purpose. To assess the amount and the axis orientation of anterior and posterior corneal astigmatism after refractive lenticule extraction (ReLEx) for myopic astigmatism. Methods. We retrospectively examined 53 eyes of 53 consecutive patients (mean age ± standard deviation, 33.2 ± 6.5 years) undergoing ReLEx to correct myopic astigmatism (manifest cylinder = 0.5 diopters (D)). Power vector anal...

Ali Rezaie Amir Iranmanesh Mohammad Reza Rezaie Rayeni Nejad,

Astigmatism’s defect has not yet been formulated in Physics and medical physics books theoretically. In this paper, we are trying to formulate the astigmatism’s defect. The results of formulation show that “the degree of astigmatism is negative reverse the distance that vision’s condition of astigmatism’s chart lines change conditions in dimness angle from dimness condition at infinite distance...

2016
Qinghe Jing Yating Tang Dongjin Qian Yi Lu Yongxiang Jiang

PURPOSE To evaluate the characteristics of the posterior corneal surface in patients with high myopia before cataract surgery. METHODS We performed a cross-sectional study at the Eye and ENT Hospital of Fudan University, Shanghai, China. Corneal astigmatism and axial length were measured with a rotating Scheimpflug camera (Pentacam) and partial coherence interferometry (IOLMaster) in a high-m...

مشفقی , لیلی, نیک‌اقبالی, امین‌ا… ,

Post cataract operation visual acuity affected by the astigmatism which it is influenced by several factors including the suture material. This study compares 8-0 vicryl (V) and 10-0 Nylon (N) suture material for induced astigmatism and its decay in time in cataract operation. This is retrospective study of consequetive case series that underwent cataract extraction and intraocular lens...

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