This paper suggested that continual and short-distance use of eyes for long time and narrow environment visual field were the main reasons for the abnormal vision.

本文认为近距离用眼持续时间过长及环境视域小等是引起视力不良的主要原因。

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Since there is little bleeding, the surgeon maintains a clear field of vision during the procedure, enabling complete removal of the abnormal tissue while avoiding critical nerves and blood vessels.

由于出血少，外科医生在整个操作过程中保持清晰的视野，可以完整的切除异常组织而避免损伤重要的神经和血管。

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Glaucoma: This is caused by an abnormal rise in pressure in the eyes that damages the optic nerve and results in defective vision and narrowed visual field.

青光眼：眼球压力过高导致视觉神经受破坏，患者的视力下降及视野缩窄。

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