由于全身性、眼局部或脑神经系统不适,如身体衰弱、重笃疾病或大出血后健康未全恢复,眼结膜炎、屈光不正,神经衰弱等,以致在近处作业,阅读书刊或其它使用眼力的精微作业的时间稍为长久或光线稍暗,即感近处物像或细小字体恍惚难辨,模糊不清,并觉眼球 Due to generalized, ocular or cerebral nervous system discomfort, such as physical weakness, severe diseases or heavy bleeding after the health is not fully recovered, conjunctivitis, refractive errors, neurasthenia, etc., so close to homework, reading books or other use Eyesight subtle work slightly longer time or light darker, that the sense of near objects or small fonts trance is difficult to distinguish, blurred, and eyeball