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夜盲发生的主要原因是由於饍食中缺乏甲种维生素。甲种维生素为维持外皮组织的主要因素,缺乏时最易发现之病象为眼及皮肤之变化,此外呼吸器官亦往往因缺乏此种维生素而减低抵抗细菌传染的能力。眼病状——夜盲为甲种维生素缺乏的初期病象,如长期缺乏易引起其他病象如角模软化、角膜溃疡等。夜盲可行黑暗适应检查,因人在黑暗中的视力,由於网膜柱形细胞的视紫素,视紫素系白素与甲种维生素结合而成,於强光照射後视紫素分解,其恢复情形视体内甲种维生素之多寡而决定,於甲种维生素缺乏时其恢复程度较正常人为长。利用此原理可用黑暗适应器,测定人体内甲种维生素缺乏
The main reason for night blindness is the lack of a vitamin A in the diet. A kind of vitamin is the main factor to maintain the skin tissue, the lack of the most easily found disease and eye changes in the eyes, in addition to respiratory organs often due to the lack of such vitamins and reduce the ability to resist bacterial infection. Eye symptoms - night blindness is a lack of early vitamin A disease, such as long-term lack of easy to cause other diseases such as corner mold softening, corneal ulcers and so on. Night blind feasible dark adaptation test, due to the dark eyesight, due to retinal cylindrical cells of the rhodopsin, rhodopsin and vitamin A combination of vitamin A, in strong light irradiation, the purple decomposition, its Recovery situation depends on the amount of vitamins in the body of a decision, in the absence of a vitamin a recovery of its length is longer than normal. The use of this principle can be dark adapters, the body of a human vitamin deficiency