白内障囊外摘除术中上方与颞侧角膜切口所致的角膜散光
Corneal astigmatism induced by superior versus temporal corneal incisions for extracapsular cataract extraction.
作者信息
Wong H C, Davis G, Della N
机构信息
Department of Ophthalmology, Flinders Medical Centre, South Australia.
出版信息
Aust N Z J Ophthalmol. 1994 Nov;22(4):237-41. doi: 10.1111/j.1442-9071.1994.tb00790.x.
PURPOSE
We tested the hypothesis that superior corneal sections induce a shift to 'against-the-rule' astigmatism and temporal corneal sections lead to the preferred 'with-the-rule' astigmatism.
METHODS
We conducted a prospective randomised trial of superior versus temporal corneal incisions in extracapsular cataract surgery in a hospital practice. Thirty nine eyes of 37 patients were included. The induced astigmatism was analysed by three methods.
RESULTS
When analysed by Cravy's method of induced astigmatic cylinders, the superior incision induced a greater degree of 'with-the-rule' astigmatic cylinder prior to sutures removal on day 77 (P < 0.049). Long term, the temporal incision produced 1.44 dioptre of 'with-the-rule' astigmatism, while the superior section produced 0.08 dioptre of 'against-the-rule' astigmatism (P < 0.001).
CONCLUSION
The results of this small trial indicates that the superior corneal incision produces significantly less astigmatism than the temporal incision. The temporal incision induces a moderate degree of 'with-the-rule' astigmatism.
目的
我们检验了如下假设，即上方角膜切口会导致散光轴向转变为“逆规散光”，而颞侧角膜切口会导致更常见的“顺规散光”。
方法
我们在一家医院的临床实践中，针对囊外白内障手术中上方与颞侧角膜切口进行了一项前瞻性随机试验。纳入了37例患者的39只眼。通过三种方法分析诱导性散光。
结果
根据Cravy诱导散光柱镜法分析，在第77天拆除缝线前，上方切口诱导产生的“顺规散光柱镜”程度更高（P < 0.049）。长期来看，颞侧切口产生1.44屈光度的“顺规散光”，而上方切口产生0.08屈光度的“逆规散光”（P < 0.001）。
结论
这项小型试验的结果表明，上方角膜切口产生的散光明显少于颞侧切口。颞侧切口会诱导产生中度的“顺规散光”。
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