Analysis of Corneal Aberration of the Human Eye

Khorin, Pavel A.; Хонина, С. Н.; Karsakov, A. V.; Branchevskiy, S. L.

doi:10.18287/2412-6179-2016-40-6-810-817

Cited by 21 publications

(5 citation statements)

References 12 publications

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“…Based on the data obtained, an analysis of aberrations of the cornea of the human eye was carried out [ 53 ]. As a result, the basic Zernike functions were identified, which are most characteristic of some pathologies of the cornea (myopia of various degrees), the compensation of which leads to an improvement in the quality of the formed image.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the data obtained in the eye clinic, in the form of weight coefficients (the first 15 basis functions) of the Zernike polynomials of the anterior

and posterior

surfaces of the cornea, the averaged values for a healthy eye were calculated ( Figure 1 ). It should be noted that the weight coefficients of the Zernike polynomials have different signs for most pronounced canonical aberrations on the anterior and posterior surfaces of the cornea, which leads to partial intracorneal compensation of the aberrations [ 53 ]. Therefore, there is no need to compensate them by changing the heights of the anterior surface of the cornea.…”

Section: Methodsmentioning

confidence: 99%

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Simulation of the Human Myopic Eye Cornea Compensation Based on the Analysis of Aberrometric Data

Khorin

Хонина

2023

Vision

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Various diffractive, refractive and holographic optical elements, such as diffraction gratings; microlens raster; phase plates; multi-order diffractive optical elements; adaptive mirrors; diffractive and refractive axicons; holographic multiplexes and many others are used to analyze wavefront aberrations. We shortly discuss the features (advantages and disadvantages) of various wavefront aberration sensors in the Introduction. The main part of the paper is devoted to the analysis of the weight coefficients of Zernike polynomials obtained during medical examinations of the cornea in the human eye. Using data obtained by aberrometers, the average values of the Zernike polynomial coefficients for the anterior and posterior surfaces of the healthy eye cornea and a myopic one were calculated. The original wavefront for the anterior and posterior surfaces of the cornea was restored separately, as well as the total wave aberration. For an objective assessment of the quality of vision, the corresponding point spread functions (PSFs) were calculated. We propose to compensate for the aberrations of the myopic eye, taking into account the physical features of the corneal surface. The results of numerical simulation showed that in order to improve the quality of the patient’s vision, it is necessary to take into account high-order aberrations of the anterior surface of the cornea in the form of a coma of the third order and aberrations of the fourth order.

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Section: Methodsmentioning

confidence: 99%

“…Based on the data obtained in the eye clinic, in the form of weight coefficients (the first 15 basis functions) of the Zernike polynomials of the anterior

and posterior

Section: Methodsmentioning

confidence: 99%

Simulation of the Human Myopic Eye Cornea Compensation Based on the Analysis of Aberrometric Data

Khorin

Хонина

2023

Vision

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“…Анализ информативности весовых коэффициентов В исследовании использовались данные, полученные в глазной клинике Бранчевского, как для условно здоровых людей (без выраженных патологий как на зрачке, так и на хрусталике), так и с определёнными патологиями, в частности, с миопией слабой и средней степени. В работе [20] был произведён статистический анализ на основе выборки из 150 измерений. Были выделены базисные функции Цернике, наиболее характерные для некоторых патологий глаза.…”

Section: рис 1 пример анализа передней поверхности роговицыunclassified

Informative feature selection based on the Zernike polynomial coefficients for various pathologies of the human eye cornea

Khorin¹,

Ilyasova²,

Paringer³

2018

Computer Optics

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The study was devoted to the analysis of wavefront aberrations under changes of the cornea surface curvature in the human eye. The analysis was based on the representation of aberrations of the front and rear corneal surfaces as superposition of Zernike functions. Weight coefficients of the Zernike polynomials were the object of this study. The data under analysis were obtained in a number of clinical trials in the Branchevski’s eуе clinic. The most informative weight coefficients were analyzed from the point of view of classification of patients by particular diagnosis. A comparison of the classification results was carried out using thirty front and rear corneal features, as well as the most informative features. The features were ranked by the informativity criterion for solving a specific classification task. While doing analysis, the informativity was evaluated on the basis of values of a separability criterion. An additional estimation of informativeness was carried out by calculating the classification error by a K-means method. As a result of the analysis, basic Zernike functions that are most informative for particular eye pathologies were identified.

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“…These approach and algorithm are discussed in detail in paper [13]. 2D patterns of point-spread function are shown in figure 3.…”

Section: Wavefront Aberrationsmentioning

confidence: 99%

Wavefront aberration analysis with a multi-order diffractive optical element

Khorin¹,

Degtyarev²

2017

Collection of Selected Papers of the III International Conference on Information Technology and Nanotechnology

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In this paper we show an ability to use a multi-order (multi-channel) diffractive optical element for wavefront relief function expansion in terms of Zernike polynomials. This approach can be successfully used for small meanings of wavefront aberrations when the wavefront relief can be represented as a linear superposition of Zernike polynomials. Unfortunately, linear approximation is becoming unworkable with increasing of aberration meanings. In this work we study an applicability of this Zernike expansion method.

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Analysis of Corneal Aberration of the Human Eye

Cited by 21 publications

References 12 publications

Simulation of the Human Myopic Eye Cornea Compensation Based on the Analysis of Aberrometric Data

Simulation of the Human Myopic Eye Cornea Compensation Based on the Analysis of Aberrometric Data

Informative feature selection based on the Zernike polynomial coefficients for various pathologies of the human eye cornea

Wavefront aberration analysis with a multi-order diffractive optical element

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