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3．1．2同轴性散光双眼散光轴位同为90或180,为特殊类型的对称性散光。3．1．3非对称性同向散光双眼散光轴位之和大于或小于180,双眼同为顺律、逆律或斜位散光,如：115／80、a65／5、180／15等。根据轴位性质又可以分为：3．1．3．1同向顺律散光,如近视180／30或远视120／85等。可进一步分为：①同向顺律异区散光,如近视5／155或远视95／65等。②同向顺律同区散光,如：近视5／25或远视95／115等。3．1．3．2同向逆律散光,如近视90／65或远视5／150等。①同向逆律异区散光,如近视115／85或远视25／175等。②同向逆律同区散光,如近视65／85或远视150／175等。3．1．3．3同向斜向散光,如：55／145等。
3.1.2 coaxial astigmatism binocular astigmatism axis with the same 90 or 180, a special type of symmetrical astigmatism. 3.1.3 Asymmetry Astigmatism Binocular astigmatism axial sum of greater than or less than 180, both eyes with the same law, inverse law or oblique astigmatism, such as: 115/80, a65 / 5,180 / 15 and so on. According to the axial nature and can be divided into: 3.1.3.1 with the same direction astigmatism, such as myopia 180/30 or hyperopia 120/85 and so on. Can be further divided into: ① the same direction with different regions astigmatism, such as myopia 5/155 or hyperopia 95/65 and so on. ② the same direction with the law of the same area astigmatism, such as: myopia 5/25 or hyperopia 95/115 and so on. 3.1.3.2 Astigmatic reverse astigmatism, such as 90/65 myopia or hyperopia 5/150 and so on. ① with the same direction of ascites different regions astigmatism, such as myopia 115/85 or hyperopia 25/175 and so on. ② the same direction with the inverse astigmatism law, such as myopia 65/85 or hyperopia 150/175 and so on. 3.1.3.3 co-oblique astigmatism, such as: 55/145 and so on.