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.

scholarly journals Research on Laser Dazzle Simulation Using ZEMAX Software and MATLAB

2020 ◽  
Vol 327 ◽  
pp. 02001
Author(s):  
Niu jin ◽  
Xu xiping ◽  
An zhiyong
Keyword(s):  
Ray Tracing ◽  
Programming Language ◽  
Optical Design ◽  
Optical Element ◽  
Analysis Model ◽  
Software Simulation ◽  
Scope Of Application ◽  
Disability Glare ◽  
Design Software ◽  
Calibration And Verification

The dazzling process of the laser has been digitally simulated. First, the optical design software (ZEMAX) is combined with the scientific programming language (MATLAB), then the ray tracing is used to build the scattering model of each optical element, and finally compared with a simpler model based on CIE disability glare data to achieve the calibration and verification of the software simulation effect. The results show that this advanced optical eye simulation technology can be used to study the laser glare efficiency, and it is possible to expand the scope of application of the analysis model.

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

Development of a human eye model for visual performance assessment

2009 ◽  
Author(s):  
Chong-Jhih Jiang ◽  
Yi-Chun Chen ◽  
Tsung-Hsun Yang ◽  
Ching-Cherng Sun
Keyword(s):  
Performance Assessment ◽  
Visual Performance ◽  
Eye Model ◽  
Human Eye

scholarly journals Aberration analysis of AOTF-based stereoscopic spectral imager using optical design software

2021 ◽  
Vol 2127 (1) ◽  
pp. 012035
Author(s):  
VI Batshev ◽  
A V Gorevoy ◽  
V E Pozhar ◽  
A S Machikhin
Keyword(s):  
Ray Tracing ◽  
Narrow Band ◽  
Optical Design ◽  
Three Dimensional ◽  
Imaging Systems ◽  
Optical Aberrations ◽  
Program Module ◽  
Polarized Beams ◽  
Design Software ◽  
Spectral Imager

Abstract Stereoscopic spectral imagers using acousto-optic tunable filters (AOTF) provide high-resolution narrow band images acquired from two viewpoints with different polarization in arbitrary spectral intervals, which allows obtaining three-dimensional hyperspectral models of inspected objects for many applications. We discuss modeling of acousto-optic (AO) cell for optical system design and introduce a program module for ray tracing through AO cell compatible with Zemax optical design software. A detailed study of the optical aberrations that limit the image quality in two AOTF-based stereoscopic systems implementing simultaneous AO diffraction of two differently polarized beams in single AO cell is presented. This approach may be used to design various AOTF-based imaging systems, but the limitations of ray tracing analysis should be considered.

scholarly journals Visual Performance and Quality of Life after Femtosecond Laser-Assisted Cataract Surgery with Trifocal IOLs Implantation

2021 ◽  
Vol 10 (14) ◽  
pp. 3038
Author(s):  
Carla Enrica Gallenga ◽  
Rossella D’Aloisio ◽  
Erminia D’Ugo ◽  
Luca Vecchiarino ◽  
Luca Agnifili ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Contrast Sensitivity ◽  
Spherical Aberration ◽  
Visual Performance ◽  
Prospective Clinical Study ◽  
Depth Of Focus ◽  
The Difference ◽  
Group 2 ◽  
Group 1

Purpose: To assess visual performance and quality of life after implantation of diffractive trifocal IOLs with enhanced depth of focus (Acriva Reviol Tri-ED) compared to monofocal IOLs. Setting: Ophthalmology Clinic, Department of Medicine and Science of Ageing, University “G. d’Annunzio” Chieti-Pescara, Italy. Design: Prospective clinical study. Methods: This study comprised 36 eyes of 18 patients with senile cataract candidates for phacoemulsification and implantation of the Acriva Reviol Tri-ED (Group 1–18 eyes) and the AcrySof IQ Monofocal IOL SN60WF (Group 2–18 eyes). The main outcome measures, over a 6-month follow-up period, were uncorrected and corrected visual acuity at different distances (40, 60 cm and 4 m), defocus curve, contrast sensitivity and wavefront error. Patient satisfaction was evaluated by means of the NEI-RQL-42 questionnaire. Results: At 180 days postoperatively, the difference of the UCDVA and CDVA between the groups was not statistically significant (p = 0.888 and p = 0.843, respectively). The difference between the groups was statistically significant for UCIVA (p = 0.019) and UCNVA (p = 0.036). The mean values of contrast sensitivity under photopic and mesopic conditions were not significantly different between the groups. The RMS of spherical aberration was significantly lower in Group 1 compared to Group 2. The NEI-RQL-42 questionnaire showed statistically significant differences between the groups for the dependence on correction (p < 0.001). Conclusions: The diffractive trifocal IOL with enhanced depth of focus Acriva Reviol Tri-ED was effective in improving functional capacity for intermediate and near vision compared to monofocal IOLs and provided a good quality of vision due to a significant reduction in spherical aberration.

“Hard Copy and Cathode Ray Tube Visual Performance—Are There Differences?”

1979 ◽  
Vol 23 (1) ◽  
pp. 367-368
Author(s):  
Ronald R. Mourant ◽  
Raman Lakshmanan ◽  
Michael Herman
Keyword(s):  
Small Area ◽  
Light Level ◽  
Visual Performance ◽  
Hard Copy ◽  
Eye Lens ◽  
Continuous Action ◽  
Cathode Ray Tube ◽  
Visual Mechanism ◽  
The Difference

The difference between image quality of hard copy (printed) material and cathode ray tube (CRT) terminal screens are that CRT characters are relatively blurred and that they have small area flicker. The relatively blurred CRT characters may result in continuous action of the eye lens to achieve proper focus. The small area flicker also results in the nerve receptors of the eyes constantly adjusting to the varying light level. Thus, the visual mechanism may be stressed more resulting in visual discomfort and fatigue.

scholarly journals Course for undergraduate students: analysis of the retinal image quality of a human eye model

2014 ◽  
Author(s):  
Maria del Mar Pérez ◽  
Ana Yebra ◽  
Alicia Fernández-Oliveras ◽  
Razvan Ghinea ◽  
Ana M. Ionescu ◽  
...  
Keyword(s):  
Image Quality ◽  
Undergraduate Students ◽  
Retinal Image ◽  
Eye Model ◽  
Human Eye

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
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