During development there was decrease in the degree of hypermetropia of increase in the degree of myopia (75% ) on the major spherical changes of all cases.
全部病例球镜的主要变化为远视度数减少或近视度数增加（75％）。
2
The easy and correct theoretical calculating formula is provided for calculating degree of freedom of planar and spherical mechanism.
为计算平面、球面机构与结构自由度提供了更为方便快捷正确的理论计算式。
3
Panoramic images, varying according to projection models, can generally be divided into polyhedral panoramic images, spherical panoramic images and 360-degree panoramic cylinders.