Investigation on Using Fresnel Lens in Human Eye

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Eskandari, Mohammad Amin | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48986 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Seyyed Reihani, Nader
Abstract:
Human eye is one of the most important organs of the human body. Performance of the eye may be decreased by some anomalies such as myopia, hyperopia, astigmatism, cataract, glaucoma, etc. There are variety of techniques to treat eye anomalies including surgery, using optical elements and training methods.The easiest way of treating refractive errors of the eye, is to use optical elements such as contact lenses, intraocular lenses and glasses. In the case of cataract, Crystalline lens loses its opacity and should be replaced by artificial lens. The best choice is Fresnel lens which has lower weight and thickness than refractive lenses.Fresnel lens is a diffractive optical element which uses diffraction and interference of electromagnetic waves to focus the light. Since Fresnel lens has low weight and small thickness, it may easily be replaced by crystalline lens. Moreover, this kind of lens can be designed in such a way that they act as a bifocal or multifocal lens to simulate accommodation of the crystalline lens.In this project Liou and Brennan schematic eye model was used to investigate performance of bifocal Fresnel lens in the human eye. It was shown that the aberrations of bifocal lens is lower than or same as the aberrations of crystalline lens.
Keywords:
Fresnel Lens ; Eyes ; Eye Anomalies

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