An eyepiece with wide apparent field (in degrees) and lower powers used on a telescope allow wider fields of view.

较宽的目镜视场搭配较低的放大率可以得到更宽的视场角。

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Eyepiece: wide field , high-point eyepiece , it can observe image of observation specimen with glasses.

目镜： 使用高眼点广角目镜，为佩戴眼睛的观察者提供方便。

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A novel lightweight, wide field-of-view eyepiece for HMD is achieved using a free-form-surface (FFS) prism. The design method is discussed and the design result is presented.

通过采用自由曲面(FFS)棱镜实现了大视场轻型头盔显示器目视光学系统，讨论了FFS头盔显示系统的设计方法并给出了设计结果。

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