vertex of lens

英 [ˈvɜːteks ɒv lenz]

美 [ˈvɜːrteks əv lenz]

【医】透镜顶

There are two methods mainly used for determination of back vertex power of contact lens.
国际上关于角膜接触镜后顶焦度的测量主要分为两种，即：空气法和溶液法。
Analysis of feasibility for paraxial back vertex length of contact lens
测量接触镜近轴后顶焦距可行性分析
Optical coherence tomography for ophthalmic imaging Results: The spectacle magnification is relative to the power of the correcting lens and distance of eye from the back vertex of the lens.
结果：镜片角放大率与矫正镜片屈光力，以及镜眼距有关。
Conclusion: When the incident pupil 2h of focimeter is corresponding with human pupil, the measuring value of the back vertex power is the real back vertex power of contact lens the reciprocal of distance on the orientation of image L0.87h ′ of band height 0.87h light.
结论：焦度仪的入瞳2h与人眼瞳孔相匹配时，测量的接触镜后顶焦度就是接触镜实际后顶焦距&带高0.87h光线的像方截距L0.87h′的倒数。
Measurement of vertex power of spectacle lens and contact lens
眼镜镜片及角膜接触镜的顶焦度测量