نتایج جستجو برای: schematic eye

تعداد نتایج: 163137  

Journal: :iranian journal of medical physics 0
maryam abolmasoomi m.sc.in medical physics, tehran university medical sciences, tehran, iran keykhosro keshavarzi assistant professor, medical physics dept., tehran university medical sciences, tehran, iran mehran nikkhou eye specialist, ophthalmology dept., milad hospital ebrahim jafarzadeh poor associate professor, medical physics dept., tehran university medical sciences, tehran, iran

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...

2014
Ping Xie Zizhong Hu Xiaojun Zhang Xinhua Li Zhishan Gao Dongqing Yuan Qinghuai Liu

OBJECTIVE To construct a life-sized eye model using the three-dimensional (3D) printing technology for fundus viewing study of the viewing system. METHODS We devised our schematic model eye based on Navarro's eye and redesigned some parameters because of the change of the corneal material and the implantation of intraocular lenses (IOLs). Optical performance of our schematic model eye was com...

Journal: :Journal of the Optical Society of America A 1985

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...

2011
Jiaze Wu Changwen Zheng Xiaohui Hu Fanjiang Xu

A novel method is proposed to accurately simulate the peripheral vision under different visual perception. An accurate aspherical schematic eye model is firstly introduced to reasonably predict the anatomical and optical properties of the human eye. This eye model is composed of the Navarro schematic eye model with aspherical surfaces as a basic model, and a corresponding accommodation model, a...

Journal: :Investigative ophthalmology & visual science 2009
Qianying Gao Xiang Chen Jian Ge Yongji Liu Zhaoxin Jiang Zhi Lin Yaqin Liu

PURPOSE To determine and compare the refractive shifts based on Gullstrand-Emsley and Liou-Brennan schematic eyes after filling them with four selected artificial vitreous substitutes: silicone oil, heavy silicone oil, hydrogels, and encapsuled balanced salt solution. METHODS The optical constants of artificial vitreous body-filled eyes were calculated based on Gullstrand-Emsley and Liou-Bren...

Journal: :Journal of the Optical Society of America A 1999

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