Constructing a human eye model: The cornea shape effect on optical imaging for the human eyes

2010 ◽  
Author(s):  
Jihong Feng ◽  
Hanyu Zhang ◽  
Xiaobing Wang ◽  
Aizhen Liu
Keyword(s):  
Optical Imaging ◽  
Shape Effect ◽  
Eye Model ◽  
Human Eye ◽  
Human Eyes

Research of bright pupil effect based on Chinese human eye model

2014 ◽  
Vol 12 (11) ◽  
pp. 113301-113303 ◽  
Author(s):  
Meimei Kong Meimei Kong ◽  
Zhen Li Zhen Li
Keyword(s):  
Eye Model ◽  
Human Eye

Research of the aberrations of human eyes with accommodation based on eye model

2011 ◽  
Author(s):  
Wei Quan ◽  
Feng-lin Wang ◽  
Zhao-qi Wang
Keyword(s):  
Eye Model ◽  
Human Eyes

scholarly journals Development of a human eye model incorporated with intraocular scattering for visual performance assessment

2012 ◽  
Vol 17 (7) ◽  
pp. 0750091 ◽  
Author(s):  
Yi-Chun Chen ◽  
Chong-Jhih Jiang ◽  
Tsung-Hsun Yang ◽  
Ching-Cherng Sun
Keyword(s):  
Performance Assessment ◽  
Visual Performance ◽  
Eye Model ◽  
Human Eye

Specific Absorption Rate and Temperature Increase in Human Eye Subjected to Electromagnetic Fields at 900 MHz

2012 ◽  
Vol 134 (9) ◽  
Author(s):  
Teerapot Wessapan ◽  
Phadungsak Rattanadecho
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Electromagnetic Fields ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Specific Absorption ◽  
Eye Model ◽  
Human Eye

Human eye is one of the most sensitive parts of the entire human body when exposed to electromagnetic fields. These electromagnetic fields interact with the human eye and may lead to cause a variety of ocular effects from high intensity radiation. However, the resulting thermo-physiologic response of the human eye to electromagnetic fields is not well understood. In order to gain insight into the phenomena occurring within the human eye with temperature distribution induced by electromagnetic fields, a detailed knowledge of absorbed power distribution as well as temperature distribution is necessary. This study presents a numerical analysis of specific absorption rate (SAR) and heat transfer in the heterogeneous human eye model exposed to electromagnetic fields. In the heterogeneous human eye model, the effect of power density on specific absorption rate and temperature distribution within the human eye is systematically investigated. In particular, the results calculated from a developed heat transfer model, considered natural convection and porous media theory, are compared with the results obtained from a conventional heat transfer model (based on conduction heat transfer). In all cases, the temperatures obtained from the developed heat transfer model have a lower temperature gradient than that of the conventional heat transfer model. The specific absorption rate and the temperature distribution in various parts of the human eye during exposure to electromagnetic fields at 900 MHz, obtained by numerical solution of electromagnetic wave propagation and heat transfer equation, are also presented. The results show that the developed heat transfer model, which is the more accurate way to determine the temperature increase in the human eye due to electromagnetic energy absorption from electromagnetic field exposure.

Optical system of human eye model

2010 ◽  
Author(s):  
Vladislav V. Druzhin ◽  
Alexey P. Tsapenko
Keyword(s):  
Optical System ◽  
Eye Model ◽  
Human Eye

SIMULATING THE EFFECTS OF ELEVATED INTRAOCULAR PRESSURE ON OCULAR STRUCTURES USING A GLOBAL FINITE ELEMENT MODEL OF THE HUMAN EYE

2017 ◽  
Vol 17 (02) ◽  
pp. 1750038 ◽  
Author(s):  
PEISHAN DAI ◽  
YALI ZHAO ◽  
HANWEI SHENG ◽  
LING LI ◽  
JING WU ◽  
...  
Keyword(s):  
Finite Element ◽  
Intraocular Pressure ◽  
Element Model ◽  
Global Model ◽  
Eye Model ◽  
Human Eye ◽  
Anterior Eye Segment ◽  
Elevated Intraocular Pressure ◽  
Biomechanical Responses ◽  
Iop Elevation

Elevated intraocular pressure (IOP) may be the primary risk factor to the development of glaucoma. Finite element (FE) modeling is commonly considered as an effective method to quantitatively analyze pathogenesis of glaucoma. Recent researches focus on establishing partial human eye models. A refined global human eye model was developed using ANSYS software to investigate the correlation between IOP elevation and biomechanical responses. First, the pressure transferring process according to IOP elevation in the whole eye was analyzed to simulate the effects of IOP elevation on glaucoma. Then, the biomechanical responses of the anterior eye segment under various pressure differences between the anterior and posterior chambers (AC and PC) were analyzed to simulate posterior nonadhesion of iris and posterior synechia. This global eye model not only simulated the responses of elevated IOP on ocular structures, but also revealed the process of pressure transferring among each tissue from the anterior eye segment to the optic nerve head (ONH) region. The local mechanical characteristics of the ocular structures obtained from the global model agreed with previous findings. This global model may shed light on the studies of multifactorial glaucoma.

scholarly journals Does the foveal shape influence the image formation in human eyes?

2017 ◽  
Vol 6 (5) ◽  
Author(s):  
Katharina Frey ◽  
Beatrice Zimmerling ◽  
Patrick Scheibe ◽  
Franziska G. Rauscher ◽  
Andreas Reichenbach ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Anterior Part ◽  
Image Formation ◽  
Eye Model ◽  
Shape Influence ◽  
Human Eyes ◽  
Propagation Aspects

AbstractIn human eyes, the maximum visual acuity correlates locally with the fovea, a shallow depression in the retina. Previous examinations have been reduced to simple geometrical fovea models derived from postmortem preparations and considering only a few superficial ray propagation aspects. In the current study, an extended and realistic analysis of ray-optical simulations for a comprehensive anatomical realistic eye model for the anterior part and realistic aspherical human foveal topographical profiles deduced from

scholarly journals A Water Balloon Eye Model for Teaching about the Human Eye

2020 ◽  
Vol 82 (5) ◽  
pp. 341-343
Author(s):  
Kwok-chi Lau
Keyword(s):  
Intraocular Pressure ◽  
Eye Model ◽  
Human Eye ◽  
Convex Lens

A physical eye model made of a water balloon and a convex lens is described. It can be used to model how an image is formed in the eye as well as shortsightedness and farsightedness. The model is unique in featuring a fluid-filled “eyeball” with “intraocular pressure,” making it a useful tool for teaching about accommodation and glaucoma. Instructional ideas for the model are suggested.

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