为合理选择不同材质的角膜接触镜,基于几何光学成像的原理,建立了基于角膜接触镜的角膜成像模型,分析了不同折射率的角膜接触镜对角膜成像质量的影响;利用逆光学成像思维,设计了一种用于检测成像质量变化的近轴光学系统,分别将不同材料和厚度的角膜接触镜加入该光学系统,定量分析不同材质的角膜接触镜对成像质量的影响。该光学系统的有效焦距为18.36 mm,筒长为36.49 mm,像高为2.48 mm,调制传递函数值接近极限衍射,全视场的畸变量小于0.1%。ZEMAX仿真结果表明:材料为硬性角膜接触镜PMMA、厚度为0.05 mm的角膜接触镜可同时满足增强现实技术中接触式设备的成像和佩戴需求。

In order to reasonably select corneal contact lenses of different materials, based on the principle of geometric optical imaging, a corneal imaging model based on contact lenses is established, and the influences of contact lenses with different refractive indexes on corneal imaging quality are analyzed. By using the idea of reverse optical imaging, a paraxial optical system for detecting imaging quality is designed, the corneal contact lenses of different materials and thicknesses are added respectively, and the influences of corneal contact lenses of different materials on the imaging quality are quantitatively analyzed. The effective focal length of the optical system is 18.36 mm, the total length is 36.49 mm, the image height is 2.48 mm, the modulation transfer function value is close to limit diffraction, and the distortion of the full field-of-view is less than 0.1%. ZEMAX simulation results show that the material of the contact lens is PMMA and the thickness is 0.05 mm, which can meet the imaging and wearing requirements of contact devices in augmented reality techniques.