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检影作为一种特殊的验光方法,是通过观察影动的变化来完成的。最主要的影动分为逆动与顺动,中和不动是很难见到的情况,或者只是在理论上存在。如果没有影动的顺逆变化是难以进行检影验光的。
As a special retinoscopy optometry method is through the observation of changes in the shadow to complete. The main shadow motion is divided into reverse action and smooth movement, neutrality is hard to see, or just exists in theory. If there is no shadow of the change is difficult to carry out retinoscopy optometry.