Ray-tracing the human eye model to assess injury potential for laser beam configurations

1997 ◽  
Author(s):  
Howard J. Carter
Keyword(s):  
Laser Beam ◽  
Ray Tracing ◽  
Eye Model ◽  
Human Eye ◽  
Injury Potential

scholarly journals Intraocular Telescopic System Design: Optical and Visual Simulation in a Human Eye Model

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Georgios Zoulinakis ◽  
Teresa Ferrer-Blasco
Keyword(s):  
Ray Tracing ◽  
Optical Design ◽  
Visual Performance ◽  
Eye Model ◽  
Human Eye ◽  
Telescopic System ◽  
Custom Made ◽  
Design Software ◽  
The Difference

Purpose. To design an intraocular telescopic system (ITS) for magnifying retinal image and to simulate its optical and visual performance after implantation in a human eye model. Methods. Design and simulation were carried out with a ray-tracing and optical design software. Two different ITS were designed, and their visual performance was simulated using the Liou-Brennan eye model. The difference between the ITS was their lenses’ placement in the eye model and their powers. Ray tracing in both centered and decentered situations was carried out for both ITS while visual Strehl ratio (VSOTF) was computed using custom-made MATLAB code. Results. The results show that between 0.4 and 0.8 mm of decentration, the VSOTF does not change much either for far or near target distances. The image projection for these decentrations is in the parafoveal zone, and the quality of the image projected is quite similar. Conclusion. Both systems display similar quality while they differ in size; therefore, the choice between them would need to take into account specific parameters from the patient’s eye. Quality does not change too much between 0.4 and 0.8 mm of decentration for either system which gives flexibility to the clinician to adjust decentration to avoid areas of retinal damage.

Emulation of exact ray tracing by ABCD matrix in a human eye model

2011 ◽  
Author(s):  
J. F. Aguilar-Gutiérrez ◽  
L. Arroyo Carrasco ◽  
A. Cordero-Dávila ◽  
S. Chávez ◽  
D. Iturbe-Castillo
Keyword(s):  
Ray Tracing ◽  
Eye Model ◽  
Human Eye ◽  
Abcd Matrix

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

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
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