摘要
目的 研究正常和分开过强型间歇性外斜视儿童手术前、后不同距离立体视的变化。方法 对 4～ 12岁正常组儿童 84 4例和患儿组因分开过强型间歇性外斜视行手术治疗的患儿 35例 ,采用TNO立体视检查法和新立体视检查法 (newstereotests,NST)检查近距离立体视 ,采用自制的中、远距离立体视检查法检查 1～ 5m立体视 ;比较不同年龄和间歇性外斜视手术前、后不同距离平均立体视锐度的差异。结果 (1)正常组 :4～ 8岁儿童约 98%TNO检查近距离立体视锐度≤ 6 0″ ,立体视锐度与年龄的增长呈直线相关性 ;10～ 11岁时立体视锐度最小 ;4～ 8岁儿童与 9～ 12岁儿童比较 ,立体视锐度分布差异有非常显著意义 (P <0 0 1) ;约 97%儿童NST检查近距离立体视锐度≥ 4 0″ ,各年龄段平均立体视锐度为 4 0″～ 4 2″。中、远距离立体视锐度 4岁时最大 ,随年龄的增长逐渐减小 ,9～ 10岁时最小 ;(2 )患儿组 :TNO和NST检查 ,手术前、后近距离立体视锐度接近 ,差异均无显著意义 (P>0 0 5 ) ;术前中、远距离立体视锐度大于正常组 ,差异有显著意义 (P <0 0 5 ) ;术后中距离立体视锐度较术前明显改善并接近正常 ,远距离立体视锐度有轻微改善。结论 (1)正常组 4岁儿童不同距离立体视开始发育 ,随年龄的增长继续发育 ,8岁后明显?
Objective To study the pre and post operative changes of stereopsis at different distances in normal and children with divergence in excess type of intermittent exotropia. Methods TNO and new stereo tests (NST) and the middle and long distance stereotest were used for the evaluation of stereoacuity at 40 cm-5 m in 844 normal and 35 children aged 4-12 years with divergence excess type of intermittent exotropia undergoing operative correction of strabismus. Result (1) Normal subjects: The TNO test showed that the near distance stereoacuity≤60″was in 98% subjects aged 4-8 years. The stereoacuity was increased with the increase of age, the correlation being linear. The stereoacuity in children aged 10-11 years was the lowest. In the comparison of stereoacuity between children aged 4-8 years and 9-12 years, the difference in distribution was very significant ( P <0 01). The NST test showed that the near stereoacuity ≥40″ was in 97% subjects. The mean stereoacuity was 40″-42″ in children various in age. The middle and far distance stereoacuity was the greatest in children aged 4 years, along with the increase of age, it was gradually declined and at 9-10 years it was the lowest. (2) Divergence excess type of intermittent extropia: There was no significant difference between the pre and post operative near stereoacuity examined by TNO and NST ( P >0 05) The pre operative middle and long distance stereoacuities were greater than that in the normal children, the difference being significant ( P <0 05). The post operative middle distance stereoacuity was improved and approximately normal in comparison with that before the surgery, and the far distance stereoacuity was improved mildly. Conclusions (1) In the normal group, the development of stereopsis at different distances begins at 4 years, keeping on developing with the increase of age, and the stereoacuity is elevated after 8 years and in 9-11 years well developed. (2) In the group of divergence excess type of intermittent exotropia, the pre operative near stereoacuity is well, but the middle and far distance stereoacuities are poor and the middle stereoacuity improves significantly after the surgery. The recovery of middle distance stereoacuity seems to be an objective criterion of the operative therapeutic effect.
出处
《中华眼科杂志》
CAS
CSCD
北大核心
2002年第8期452-456,共5页
Chinese Journal of Ophthalmology
