Warburg M
Doc Ophthalmol. 1975 Dec 30;39(2):343-9. doi: 10.1007/BF02425839.
A preliminary survey of the causes of blindness in mentally retarded children in Denmark showed that 50% of the children had optic atrophy, 12.5% had cataract while tapeto-retinal degenerations, other malformation and retrolental fibroplasia each represents 8-9% of the causes of blindness. The survey, was done through written notification and some patients with tapeto-retinal degenerations might have been wrongly diagnosed.
丹麦对智障儿童失明原因进行的一项初步调查显示，50%的儿童患有视神经萎缩，12.5%患有白内障，而视网膜色素变性、其他畸形和晶状体后纤维增生症在失明原因中各占8 - 9%。该调查是通过书面通知进行的，一些患有视网膜色素变性的患者可能被误诊。
