患儿,男,7岁。因自幼智力低下,视力差就诊。患儿系第三胎第三产,足月顺产。自幼儿起开始肥胖,并出现夜盲,视力差。4岁时仍不会叫人,不会讲话。父母体健,系近亲结婚。其母32岁,共怀6胎,5胎女性均在出生后至5个月内死亡,死因不详。体检:身高90cm,体重26kg。不会辨认视力表。睑裂小,双眼视乳头呈淡黄色。视网膜血管细小, Children, male, 7 years old. Because of my mental retardation, poor eyesight treatment. Pediatric third-third-trimester, full-term follow-up. Since the beginning of childhood obesity, and night blindness, poor eyesight. 4 years old will not be called, can not speak. Parents physical health, the Department of cousins ​​married. The mother is 32 years old, with a total of 6 pregnant women, 5 pregnant women were born to 5 months after the death, the cause of death is unknown. Physical examination: height 90cm, weight 26kg. Eye chart will not be recognized. Small palpebral fissure, binocular nipple was light yellow. Retinal blood vessels small,