近日，眼科门诊一连来了几名特殊患者，都是晚上熬夜看手机，第二天早上看不见东西了，这种疾病被称为“眼中风”。“中风”一词原指脑中风，包括缺血性和出血性脑中风，近几年被引入眼科。临床上，眼科医生把视网膜动脉阻塞这类缺血性眼病和视网膜静脉阻塞这类出血性眼病统称为“眼中风”。“眼中风”是眼科临床急症之一，不及时治疗会导致严重的视力损害。
①。第一种是中央动脉阻塞，会造成患者视力丧失，甚至永久失明。第二种是分支动脉阻塞，视力下降程度不像第一种那么严重，多表现为视野缺损。第三种是睫状动脉阻塞，②，经过治疗可能得到一定程度恢复。视网膜动脉阻塞时，③，对视功能危害越大。缺血超过90分钟，视网膜光感受器组织损害不可逆；缺血超过4小时，视网膜就会出现萎缩，即使恢复了血供，视力也很难恢复，因此患者最好能在2小时内、最迟不超过4小时内接受治疗，并尽可能保住自已的视力 视网膜静脉阻塞主要表现为眼底出血，并由此导致视物模糊变形、视野损或注视点黑影等，不及时治疗也会导致严重后果。
“眼中风”因和脑血管疾病“中风”有诸多相似而得名。与此类似，“打笔仗”源自“打仗”。请简述“打笔仗”的含义并分析它得名的缘由。
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