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Study On The Aberration Characteristic And Correction Of Actual Human Eye

Posted on:2017-03-27Degree:MasterType:Thesis
Country:ChinaCandidate:B Y GaoFull Text:PDF
GTID:2308330482996867Subject:Electronic and communication engineering
Abstract/Summary:PDF Full Text Request
This research is on the basis of wave-front technology to study about the basic and clinical issues which is scientific and technological of higher-order aberrations of the human eye in the optometry and ophthalmology fields. The main contents are about study on the construction method of mechanical systems with real vision, and, constructed out of actual human eyes optical system structural by using the optimizations of optical design software ZEMAX and the data we measured such as qw right eye corneal topography, axial length, wave-front aberration; study on the aberration compensation relationship between the cornea and lens in basis of the actual vision science system, giving the numerical results; study on the method of obtaining of aberration correction data of wave-front-guided laser corneal surgery surgical, and the surgery deviation tolerance; study on the visual correction lens and bifocal corrective glasses of higher-order aberrations of the human eye.Specific contents are as follows:(1) Construction of the actual human eyes systemsMeasure the actual human corneal surface parameters by the Orbscan II corneal topography, and fit it to the desired surface shape for the optical design software ZEMAX; measure each part of the axial length by the BMF-200 eye A/B type ultrasonic thickness measurement; using the optimizations of optical design software ZEMAX to get the optical structure parameters of human eye, and then build the actual structure of human eyes systems. Among them, the optical structure parameters of actual human eye lens are as follows, the radius of front and rear surfaces curvature of the lens is 8.449025 mm and-6.0 mm; the front surface of the lens is Zernike Standard Sag Surface, and the rear surface of the lens is Even Asphere.(2) Study on the aberration compensation relationship before the cornea and lensStudy on the aberration compensation relationship between the cornea and lens on the basis of the actual vision science system through analyzing the wave-front aberration of cornea, lens and the whole eye, and giving the numerical results of each wave-front mutual compensation.(3) Research on laser corneal wave-front-guided surgeryContrary to the problems of the obtaining of aberration correction data of wave-front-guided laser corneal surgery surgical, and the surgery deviation tolerance, to study about the method of obtaining of aberration correction data of wave-front-guided laser corneal surgery surgical, and the surgery deviation tolerance. Translation and rotation deviation tolerance in the laser corneal refractive surgery is 0.16 R(R is the radius of pupil) and 1.2°.(4) Study on visual correction lens of higher-order aberrations of the human eyeStudy on the visual correction lens of correcting aberrations of the human eye, including higher-order aberrations of the human eye in the basis of the actual vision science system we build. Choosing the visual correction lens structure parameters as the optimization variables, the ideal image of the whole system consist of the visual correction lens and the actual human eyes systems as the optimization target, getting the optical structure of the personalized high-order aberration correction lens. The construction of lens is doublet system, all the lens type is the standard spherical surface. The radius of first second third forth surface is-58.355, 17.116, 16.95 and 23.875 mm. The first lens is BK7 glass which refractive index is 1.52 and abbe number is 64.2; The second lens is SF2 glass which refractive index is 1.65 and abbe number is 33.8.(5) Research on the correction bifocal glasses of high-order aberrationStudy on the correcting of high-order aberration when the eye is regulated and unregulated because of different object distance more simple, lightweight and quick by single lens. Using single lens to achieve the correction of high-order aberration when the eye is regulated and unregulated because of different object distance. The upper half of the lens is used to correct the higher-order aberrations of the unadjusted human eye, the lower half of the lens is used to correct the higher-order aberrations of the adjusted human eye. The eyeglasses which we studied to correct the higher-order aberrations using resin material which refractive index is 1.60 and abbe number is 36.The solution of these questions has actually significance to the implementation of corrective techniques and correction device manufacture. And the study of these issues are going to promote the development of visual correction, making the visual quality of human eyes are close to the ideal level.
Keywords/Search Tags:Wave-front aberration of human eye, High-order aberration correction, Wave-front technology, Optical design
PDF Full Text Request
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