1　病例简介患者 ,男 ,16岁。因自幼双眼视力差 ,加重 2年 ,于 2 0 0 0年 4月来我院就诊。患者为第 1胎足月顺产 ,父母非近亲结婚 ,家长否认外伤、手术及家族史。全身检查 :智力发育正常 ,体检无明显异常。眼科检查 :双眼视力均为 0 1。双眼结膜、巩膜正常 ;角膜透明、大小正 1 case description Patients, male, 16 years old. Due to poor eyesight since childhood, increased 2 years, in 2004 to our hospital. The patient had full-term first trimester births, non-relatives marrying their parents, and parents denied trauma, surgery, and family history. Whole body examination: normal mental development, physical examination no obvious abnormalities. Eye examination: binocular vision are 0 1. Eyes conjunctiva, sclera normal; corneal transparency, size is positive