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在验散光时,有一种简便而适用的工具,即可变交叉园柱镜,该镜又称散光矫正器。其构造原理与普通交叉园柱镜一样,也是由两个度数相同符号相反的柱镜组成,但它不同于普通的交叉园柱镜,普通交叉园柱镜的度数量不可更变,因此,临床上常需要±0.25,±0.50和±0.75D等几个组合,随时选用才行。而可变交叉园柱镜的柱镜度数是可变的,所以,只要一个可变交叉园柱镜便可以替代数个交叉园柱镜,而不
In the test of scattered light, there is a simple and applicable tool, that is, variable cross cylindrical cylinder, the lens, also known as light correction. Its construction principle is the same as that of ordinary cross cylinders. It is also composed of two cylinders with the same sign of the same degree, but it is different from that of common cross cylinders. The number of degrees of cross cylinders can not be changed. Therefore, clinical On the often need ± 0.25, ± 0.50 and ± 0.75D and several other combinations, ready to use Caixing. The variable cross cylinder cylinder cylinder power is variable, so, as long as a variable cross cylinder cylinder can replace several cross cylinder cylinder, and not