对四组人的单字视力与并列视力进行了对比研究。发现拥挤现象在１２岁以上的眼病组占２．５％；屈光不正组占２３．２５％，两者均与视力水平无关。正常儿童组４～８岁占４７．６２％，但幅度不大，９～１２岁仅５．５６％，说明正常儿童在视觉发育期存在拥挤现象，弱视组４１．８１％有拥挤现象，且较明显，并列视力与单字视力之差≥５排的占１０．７３％，这对筛选儿童弱视具有一定的临床意义，同时对判断弱视的预后有相当价值。 The four groups of people’s single-word vision and parallel vision were compared. It was found that crowding occurred in 2.5% of eye disease patients over 12 years of age and 23.25% of patients with refractive errors, both of which were unrelated to eyesight. Normal children 4 ~ 8 years old accounted for 47.62%, but not the magnitude of 9 to 12 years old only 5.56%, indicating that normal children during the visual development of crowding phenomenon, amblyopia group 41.81% of the crowded phenomenon, and Obviously, the difference between parallel visual acuity and single-word visual acuity ≥ 5 rows accounted for 10.73%, which screening of children with amblyopia has some clinical significance, while judging the prognosis of amblyopia have considerable value.