Analysis of Instrumentation Methods in Optical Performance of Soft Contact Lenses
| Autor: | Chen, Jia Hong, 陳嘉宏 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 In optometry, spectacles and contact lenses are primary methods in vision correction; and, soft contact lenses have been widely used because of the convenience and comfort. Due to the flexibility in lens materials leading to lens deformation fitted on cornea, the optical performance of contact lenses may change after being worn on eyes with uneven cornea tomography. Therefore this thesis studies and designs a test jig for contact lens fitted with corneal shape; and, the test jig can emulate contact lenses fitted on the cornea with measured optical performance for verifications of the optical analysis. In optics design and analysis, the third-order and higher aberrations would lead to distortion and blur in vision; hence, this thesis build a contact lens measurement system with a Shark-Hartmann wavefront sensor; and, the system can measure the aberrations and back vertex power of contact lens fitted on the test jig. In addition, the results of conventional wet-cell system are compared with the results of in-house built system. The accuracy of wet cell system is confirmed; while due to the cornea tomography variation induced spherical aberration, the back vertex power has more error from the test jig measurement. Since spherical aberration is prominent in fitting of contact lenses, both the simulations and experimental results show the spherical aberration of contact lens fitted on cornea surface is significant which is similar to the condition of lenses on the eyes. The results confirm the feasibility and potential of application of the test jig in the future. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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