Symptoms of eyestrain include sore eyes and difficulty focusing, poor night vision, difficulty in focusing after concentrating on an object, headaches and sore, red inflamed and weeping eyes.

眼睛疲劳的症状包括如下：眼睛疼痛，难于集中，夜视非常差，在注视一个物体后重新集中视线很困难，头痛，眼睛发红、疼痛、感染、流泪。

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Initially, the selecting of source image of the color night vision system was done by manual work which took quite a long time with poor accuracy and restricted the automation efficiency.

而最初，夜视图像彩色化对源图的选择过程是根据夜视图像的特点依靠人工选择完成的，耗时颇多且难以准确，制约了系统的自动化程度。

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