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• W1578180530 abstract "This dissertation conducts theoretical andinstrumental aspects of research aiming at extending knowledge andunderstanding of the optical design of the human eye. The firstpart of the thesis describes a newly constructed dynamic eye modelthat includes a gradient index (GRIN) lens to simulate eyeaccommodation. The GRIN profile of the crystalline lens is definedby a single continuous GRIN equation with optical powervariability. In describing the lens accommodation process,different expansion coefficients are given to the lens nucleus andcortex to mimic lens dynamics. A relaxed state eye, a 4-Daccommodated eye and a 10-D accommodated eye are simulated on acomputer for studying and analyzing the first order and third orderproperties. This eye model can be further improved if givingaccurate biometric measurement data on accommodating eyes. Thesecond part of the thesis proposes an original interferometrictechnique that has potential for non-invasive ocular biometricmeasurements. This technique, termed spatial coherenceinterferometry, utilizes spatially incoherent monochromatic lightas the illumination source, and employs the principle of lowcoherence interferometry to perform optical sectioning. Generalizedcoherence function for a multi-layer sample is derived and thetheoretical axial longitudinal resolution is formulated. A spatialcoherence interferometer with tunable coherence length is built,and detailed instrumental design and specifications areillustrated. Factors affecting system longitudinal resolution areexamined. The instrument is first tested on plane mirrors forcharacterizing the longitudinal resolution. Various experiments areconducted including target searching, curved surface profiling andmulti-layer sample sectioning. Finally en face surface profiling isperformed on a pair of life size model eyes, and full fieldinterferograms from various ocular surfaces are generatedsequentially due to optical sectioning. In future research,biometric measurement data on accommodating eyes obtained from thespatial coherence interferometer can be used to cross-validate andimprove the theoretical eye model and the measurement accuracy ofthis technique." @default.
• W1578180530 created "2016-06-24" @default.
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• W1578180530 date "2008-01-01" @default.
• W1578180530 modified "2023-09-28" @default.
• W1578180530 title "Human lens modeling and biometric measurement technique" @default.
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