Research On Wavefront Aberration And Its Applications

Modern corneal laser surgery has been one of the effective methods for wavefront aberration correction in recent years. The excimer laser diopter correction and aberration correction have been proved efficiency and safety. Based on CAD/CAM, Applied Optics, Ophthalmology, Biomedicine and Computer techonlogy, This paper studied the principle of excimer laser aberration correction. The conception, cause of formation and representation of Wavefront aberration are introduced.An ophthalmic excimer laser system used to correct wavefront aberration is presented. The conception and Zernike representation of wavefront aberration of human eyes recommended by OSA are introduced.The connection of wavefront aberration and ablation profile is analyzed and a model for calculating ablation profile to correct wavefront aberration is presented. Because the ablation depth on the boundary is nonzero and irregular, we present a model for calculating ablation profile in a transition zone. And wherein the model is adapt to the change of size of the transition zone of corneal. The model can be used to correct wavefront aberration.The hardware and sofeware of the ophthalmic excimer laser system is designed. And the pivotal technique of the system is researched in the paper.According to this paper's research result, the ophthalmic excimer laser system used to correct wavefront aberration is developed with cooperation of Su Zhou 66 Vision Tech Co., Ltd. The system has been applied into the clinic and achieved satisfied outcomes.