Locally resolved characterization of progressive addition lenses by calculation of the modulation transfer function using experimental ray tracing

2017 ◽  
Author(s):  
Gustavo Gutierrez ◽  
David Hilbig ◽  
Friedrich Fleischmann ◽  
Thomas Henning
Keyword(s):  
Transfer Function ◽  
Ray Tracing ◽  
Modulation Transfer Function ◽  
Modulation Transfer ◽  
Progressive Addition Lenses

Characterization of the atmospheric modulation transfer function using the target contrast characterizer

1991 ◽  
Author(s):  
Wendell R. Watkins ◽  
Daniel R. Billingsley ◽  
Fernando R. Palacios ◽  
Samuel B. Crow ◽  
Jay B. Jordan
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Modulation Transfer

scholarly journals Modulation Transfer Function Analysis in Myopic Model Eye

2021 ◽  
Vol 16 ◽  
pp. 1-8
Author(s):  
Shah Farez Othman ◽  
Nizam Tamchek ◽  
Farah Diana Muhammad ◽  
Mohd Hafidz Ithnin
Keyword(s):  
Transfer Function ◽  
Ray Tracing ◽  
Refractive Error ◽  
Modulation Transfer Function ◽  
Function Analysis ◽  
Population Based ◽  
Modulation Transfer ◽  
Optical Components ◽  
Transfer Function Analysis ◽  
Tracing Method

Hitherto, the eye modelling is based on the emmetropic eye taken its ocular optical components value from the population-based studies. However, no studies have been done to study the effect of aberration of myopic refractive error by modelling the eye using the parameters from ocular biometrics and ray tracing method. This study aimed to determine the modulation transfer function (MTF) of myopic refractive error using eye modelling and ray tracing technique. Three eye models had been successfully modelled in Zemax software, namely, emmetropic Liou and Brennan, myopic Liou and Brennan, corrected myopic Liou and Brennan. The optical performance of the eye models were tested using the MTF. From the MTF analysis at 100 cycles/mm, the MTF value of both tangential and sagittal rays for myopic Liou and Brennan eye was the lowest compared to its emmetropic model. Also, the MTF value of the corrected myopic Liou and Brennan model was higher compared to the uncorrected myopic model. However, the corrected myopic model produced lower MTF values for both tangential and sagittal MTF compared with the emmetropic model of Liou and Brennan. In this study, the accuracy of the MTF for myopia correction and emmetropia were calculated. It was found that the accuracy of the MTF value for corrected myopia at tangential and sagittal rays was lower.

scholarly journals Evaluation of Geometrical Modulation Transfer Function in Optical Lens System

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Cheng-Mu Tsai
Keyword(s):  
Transfer Function ◽  
Ray Tracing ◽  
Modulation Transfer Function ◽  
Focal Length ◽  
Image Plane ◽  
Modulation Transfer ◽  
Lens System ◽  
Entrance Pupil ◽  
Optical Lens ◽  
Spread Function

This paper presents ray tracing algorithms to evaluate the geometrical modulation transfer function (GMTF) of optical lens system. There are two kinds of ray tracings methods that can be applied to help simulate the point spread function (PSF) in the image plane, for example, paraxial optics and real ray tracings. The paraxial optics ray tracing is used to calculate the first-order properties such as the effective focal length (EFL) and the entrance pupil position through less cost of computation. However, the PSF could have a large tolerance by only using paraxial optics ray tracing for simulation. Some formulas for real ray tracing are applied in the sagittal and tangential line spread function (LSF). The algorithms are developed to demonstrate the simulation of LSF. Finally, the GMTF is evaluated after the fast Fourier transform (FFT) of the LSF.

CALCULATION OF MODULATION TRANSFER FUNCTION OF AN OPTICAL SYSTEM BY USING SKEW RAY TRACING

2009 ◽  
Vol 33 (3) ◽  
pp. 429-442 ◽  
Author(s):  
Kuo-Hwa Tseng ◽  
Chieh Kung ◽  
Te-Tan Liao ◽  
Hao-Peng Chang
Keyword(s):  
Transfer Function ◽  
Ray Tracing ◽  
Optical System ◽  
Modulation Transfer Function ◽  
Image Plane ◽  
Modulation Transfer ◽  
Light Rays ◽  
Intermediate Image ◽  
Pass Through ◽  
And Performance

The resolution and performance of an optical system can be characterized by a quantity known as the modulation transfer function (MTF), which is a measurement of an optical system’s ability to transfer contrast from the specimen to the intermediate image plane at a specific resolution. Accordingly, this study employs skew ray tracing based on a 4 × 4 homogeneous coordinate transformation matrix and Snell’s law to develop a detailed methodology for determining the spot diagram on the image plane when light rays pass through the optical system. And the authors present calculations of the MTF of an optical system by using the spot diagram on the image plane. The numerical results of the proposed methodology are demonstrated using a symmetrical optical system.

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