摘要
针对人眼角膜形状的非球面性,给出了以非球面因子为参数的二次曲面来对角膜表面建模,以此推导了近视矫正量公式,给出各参数的确定方法。与球面假设的近视模型比较,在相同术区大小和矫正近视度数的情况下,非球面假设的近视矫正模型可减小角膜最大切削深度。本模型保证了正常角膜的非球性,理论上可减少术后球差,改善术后视觉质量;本模型可用于指导单纯近视的矫正。
To address the issue of human corneal modeling while accounting for spherical aberrations, The corneal surface was modeled for myopia before and after surgery as aspheric surfaces. The ablation profile for correction of myopia by changing the corneal surface aspheric factor Q was developed. The choosing of Q parameter and ablation zone size were discussed. According to the same ablation zone and refractive error, the maximal ablation depth calculated by the model presented in the paper required to correct simple myopia is little than that calculated by the model based on the sphere corneal surface. The model can be applied to correct simple myopia and can decrease the spherical error after surgery in theory.
出处
《激光生物学报》
CAS
CSCD
2009年第5期685-689,共5页
Acta Laser Biology Sinica
基金
"十五"国家计委产业化项目(计产业[2002]1329号)
江苏省科技成果转化项目(BA2005025)
关键词
近视
非球面
角膜建模
myopia
aspherical surface
corneal model
