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- W2364781643 abstract "AIM: To introduce the way to measure retinal modulation transfer function (MTF) and the optical theory, so as to testify the theoretical possibility to minimize dramatically the instrument of measuring retinal MTF by using amplitude sine grating and filtering of the zero rank phase interference sine grating. METHODS: There were so far three approaches to acquire two interfered spot light source including the ways by parallel plate, Dual Dove prism, and grating, respectively. The advantages and disadvantages of these three measurements were analyzed and compared theoretically. Each phase light intensity characteristic was analyzed by means of rectangular grating and amplitude sine grating. RESULTS: ①Two interfered spot light sources were obtained by using parallel plate and Dual Dove prism, which were the mature technology in the measurement of MTF. Their optical principle was simple, and the interference ability of two acquired interfered light spot sources was desirable with stable light intensity. In addition, for the way of Dual Dove prism, it was easily realized to intelligentize the controlling of the instrument through the eclectically-drove movement of mirror to control the distance between two interfered spot light sources. But the size of this kind of design was so big that it was difficult to move and hard for hand-held design. ②Instrument could be minimized by using rectangular grating, but because the diffraction pattern of rectangular grating was the result of modulation between diffraction of one narrow slit and the interference of multiple interfered light beam, that was to say its diffraction intensity had multiple light beam which affected the MTF measurement. ③By the form of cosine waves to modulate the amplitude of the incident light, the transmitting function of amplitude sine grating can be realized the change from 0 to 1. The diffraction pattern of amplitude sine grating included three phases diffraction (grade 0 and grade ±1). In addition, the intensity of grade ±1 was distributed symmetrically, so it was feasible to acquire two desired interfered light spot by just filtering zero rank diffraction phase. CONCLUSION: It is possible to minimize the instrument of measuring retinal MTF using amplitude sine grating and filtering of the zero rank phase interference sine grating." @default.
- W2364781643 created "2016-06-24" @default.
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- W2364781643 date "2007-01-01" @default.
- W2364781643 modified "2023-09-23" @default.
- W2364781643 title "Theoretical analysis of measuring eye modulation transfer function by amplitude grating" @default.
- W2364781643 hasPublicationYear "2007" @default.
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