Conclusion the total astigmatism axis and the binocular astigmatism axis of cornea have the characteristic of homogeneity, also the trend of symmetry.
结论双眼的全眼和角膜散光在轴向方面都具有同质性，并且具有对称或近似对称趋势。
Objective To investigate distribution rules in preschool children, the main type, degree and axis of astigmatism.
目的探讨学龄前儿童散光的类型、程度及轴向分布情况。
Since off-axis wander results in images which have astigmatism when the prism is placed in a converging beam, Glan types have slightly better imaging qualities than Nicla types.
因为当棱镜置于会聚光束中时，离轴漂移造成有像散的像，格兰型棱镜的成像质量比尼·科尔型略好。
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