有的人一到晚上，就容易看不清东西，如果没有别的眼部疾病（如白内障等），那么很可能是患上了夜盲症。夜盲症俗称“雀蒙眼”，指在光线昏暗环境下或夜晚视物不清或完全看不见东西、行动困难的症状，一般情况下，夜盲症都是由于缺乏维生素A导致的。夜盲症大概分为三类：1、暂时性夜盲由于饮食中缺乏维生素A或因某些消化系统疾病影响维生素A的吸收，致使视网膜杆状细胞没有合成视紫红质的原料而造成夜盲。这种夜盲是暂时性的，只要多吃猪肝、胡萝卜、鱼肝油等，即可补充维生素A的不足，很快就会痊愈。2、获得性夜盲往往由于视网膜杆状细胞营养不良或本身的病变引起。常见于弥漫性脉络膜炎、广泛的脉络膜缺血萎缩等，这种夜盲随着有效的治疗、疾病的痊愈而逐渐改善。3、先天性夜盲系先天遗传性眼病，如视网膜色素变性，杆状细胞发育不良，失去了合成视紫红质的功能，所以发生夜盲。预防夜盲症并不难，多吃一些维生素A含量丰富的食品，如：鸡蛋、动物肝脏等即可。
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