第3组4例，为仅查到不正常的近零视差立体视锐度者。
In group 3 consisting of 4 cases, only the abnormal zero disparity stereo acuity was found.
远立体视锐度，学龄前儿童组正常率低于其余各组（P<0.05）；
The normal ratio of far stereopsis acuity in the preschool children. group is wores than that other groups(P<0.05).
受试者视力与立体视锐度的关系：正常者立体视锐度正常率为75.5%。
Relation between eyesight and stereoacuity of participants 75.5% children have a normal stereoacuity.
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