计算法和梯度法测量AC/A在不同眼位中的应用比较

Comparison of calculated and gradient AC/A ratios among normal,exophoria and esophoria

目的:讨论分析计算法和梯度法测量调节性集合与调节的比值(AC/A)在不同眼位中的临床应用。方法:收集就诊于眼科门诊的127例近视患者,采用近远距隐斜眼位得到计算法AC/A和近距附加+1.00D得到梯度法AC/A,比较计算法和梯度法AC/A在不同眼位中的差异。结果:计算法AC/A值高于近距+1.00D梯度法AC/A值(P<0.01);对同一种方法在不同眼位组中比较发现,计算法AC/A和梯度法AC/A在不同眼位组中均有差异,内隐斜组AC/A最高,外隐斜组AC/A最低;对同一眼位组中的两种方法比较发现,在内隐斜组和正视组中计算法AC/A高于梯度法(均P<0.01),外隐斜组中两种方法测得AC/A值无差异(P>0.05)。结论:计算法AC/A高于梯度法AC/A,特别是在内隐斜患者和正视患者中使用计算法易得到高AC/A值,造成错误诊断,更推荐使用梯度法。

AIM:To analyze the clinical application of calculated and gradient accommodative convergence/accommodation ratio(AC/A)in different eye positions.METHODS:A total of 127 myopes in ophthalmology were included.The calculated AC/A was obtained by near/distance phoria and the gradient AC/A was obtained by near addition+1.00D.The differences of eye positions of the calculated and gradient AC/A were compared.RESULTS:The calculated AC/A value was higher than the near+1.00D gradient AC/C(P<0.01);Comparing the same method in different eye positions revealed that the calculated AC/A and gradient AC/A were significantly different,which has the highest AC/A in the esophoria group and the lowest AC/A in the exophoria group;Comparing the two methods in the same group revealed that the calculated AC/A in the esophoria group and the normal group was higher than the gradient AC/A(P<0.01),and there was no significant difference in the AC/A measured by the two methods in the exophoria group(P>0.05).CONCLUSION:The calculated AC/A is higher than the gradient AC/A,especially in patients with esophoria and emmetropia,it is easy to obtain high AC/A values by using the calculation method,resulting in erroneous diagnosis.The gradient method is more recommended.