Lea对比度视力表在弱视治愈儿童中的应用

The Application of Lea contrast charts to cured amblyopic children

目的 用Lea对比度视力表检查研究正常儿童以及弱视治愈儿童的视觉功能状态,寻求Lea对比度视力表是否存在某对比度水平对弱视治愈者具有特别的敏感性。方法 正常视力儿童18例（36眼）,弱视治愈者25例（41眼）,参加实验者单眼均在最佳矫正基础上均完成100%,25%,10%以及5%对比度的Lea视力表的检查。结果 正常儿童随着Lea对比度的下降视力有显著性下降（F（3,140）=6.618,P〈0.001）,弱视治愈眼随着Lea对比度的下降视力有显著性下降（F（3,160）=17.677,P〈0.001）;弱视治愈眼Lea对比度视力在100%,25%,10%,5%对比度下均比年龄匹配的正常儿童显著低下（P〈0.05）,各对比度之间的视力的变化在5%对比度下变得更加明显（P=0.022）。结论 Lea对比度视力表可以用于临床弱视治愈儿童的视功能检查;正常儿童和弱视治愈眼的Lea对比度视力,随着对比度的下降明显降低;本研究中的弱视治愈眼仍未达到正常视觉功能,临床上需要进一步的治疗。

Objective To investigate the visual function conditions of cured amblyopia, using Lea contrast charts.To seek whether there is a sensitive contrast level to cured amblyopic children. Methods 18 normal children （36 eyes） were regarded as control group, 25 cured amblyopic children （41 eyes）, all children were examined on the best corrected vision, using contrast levels of 100%,25%, 10% and 5% of Lea contrast charts. Result Lea visual acuity of normal children decreased as the contrast decrease F（3.140） = 6.618, P〈0.001）, so as the cured amblyopic eyes （F（3.160） = 17.677, P〈0.001） ; The Lea visual acuity of the cured amblyopic eyes were all lower than normal children at each contrast levels of 100%, 25%, 10% and 5% （ p〈 0.05）, and the Lea acuity of cured amblyopic eyes at 5% contrast levels were decreased more significance （ P= 0.022）. Conclusion Lea contrast visual acuity charts were an efficient method of screening test for children in clinic; Lea contrast visual acuity decreased as the contrast levels decreasing in normal children eyes and the cured amblyopic eyes; The cured amblyopic eyes in this study still never achieved the normal visual function, and they need to keep on treating.