特殊用法against-the-rule astigmatism1.反常象散anisotropic astigmatism1.各向异性象散现象electron-optical astigmatism1.电子光学象散latent astigmatism1.潜在象散lenticular astigmatism1.睛珠象散oblique astigmatism1.斜象散retinal astigmatism1.【医】视网膜性散光symmetrical astigmatism1.对称象散