方法：在知情同意的情况下，选择大学入校新生266例，平均年龄18.8±0.8岁。根据受检者屈光状态分为五组：正视组29例，低度近视组118例，中度近视组82例，高度近视组37例，屈光参差组26例(其中屈光参差组不纳入研究对象所有受试者)。在综合验光仪上测正、负相对调节力，Von Graefe法测量远、近距水平隐斜度，利用±2.00D蝴蝶镜测调节灵活度，不同组眼动参数进行统计学分析。

结果：正相对调节力正视眼组均值4.87±1.47D，低、中、高度近视组正性对调节力均值分别为2.36±1.21，2.92±1.40，2.86±1.81D，差异有统计学意义(P<0.05)； 负相对调节力正视眼组与近视眼组无统计学差异(P>0.05)； 调节灵活度在正视眼组与近视眼组间无统计学差异(P>0.05)； 远、近水平隐斜正视组与近视组之间无统计学差异(P>0.05)，但低度近视组与高度近视组间有统计学差异(P<0.05)。

结论：正相对调节明显下降引起调节储备不足形成远视性离焦可能是青年近视发病病因之一，而负相对调节力、调节灵活度及远、近水平隐斜等眼动参数与青年近视发生无关。

METHODS: In the case of informed consent, the 266 cases of University new students, which the average age was 18.8±0.8 years, were selected. According to refractive state, the volunteers were divided into 5 groups: emmetropic group(n=29), low myopia group(n=118), moderate myopia group(n=82), high myopia group(n=37), anisometropia group(n=26). The anisometropia group was not included in the objects of study. The positive and negative relative accommodation force were measured by the phoropter integrated refractometer; far and near phoria were measured by Von Graefe; adjustment flexibility was measured by ±2.00D butterfly mirror. The eye movement parameters of different groups were statistically analyzed.

RESULTS: The positive relative accommodation force of emmetropic group was 4.87±1.47D; low, medium, high myopia group were respectively 2.36±1.21D, 2.92±1.40D, 2.86±1.81D. The PRA of different myopia group were significantly lower compared with the emmetropic group, the difference was statistically significant(P<0.05); the regulation flexible degrees of emmetropia group had no significant difference compared with different myopia groups(P>0.05); far and near level phoria had no significant differences between the emmetropia and myopia group(P>0.05), there was a statistically significant difference between the low myopia and high myopia group(P<0.05).

CONCLUSION: Myopia positive relative accommodation decreased significantly may be one cause of youth myopia by causing accommodation insufficiency and forming hyperopic defocus. There was no relationship between negative adjustment relative force, adjustment flexibility, far, near phoria and youth myopia.