Burillon C, Guigon B, Durand L
Clinique Ophtalmologique A, Hôpital Edouard Herriot, Lyon, France.
J Refract Surg. 1995 Nov-Dec;11(6):453-9. doi: 10.3928/1081-597X-19951101-11.
Four-incision radial keratotomy is used for the correction of mild to moderate myopia. The traditional orientation of incisions was naturally on the horizontal and vertical meridians. We undertook a comparative study of oblique versus traditional four-incision radial keratotomy (orthogonal orientation) to show the advantage of an oblique incision orientation.
A prospective study of two groups of 21 eyes was conducted: an orthogonal group with vertical-horizontal orientation of the four incisions, and an oblique group with four obliquely oriented incisions. Spatial contrast sensitivity, glare, and night vision tests were performed and results compared. The follow up period was 3 months.
Glare and contrast sensitivity were less affected with oblique orientation of incisions. There was no significant difference regarding night vision effects. We observed a decrease in induced astigmatism with oblique orientation.
The location of horizontal incisions within the palpebral fissure and the unequal lengths of horizontal and vertical incisions are responsible for ocular alterations. An oblique orientation is preferable to avoid glare, starburst, and induced astigmatism.
四切口放射状角膜切开术用于矫正轻度至中度近视。传统的切口方向自然是在水平和垂直子午线上。我们对斜向与传统四切口放射状角膜切开术（正交方向）进行了一项对比研究，以显示斜向切口方向的优势。
对两组各21只眼进行了一项前瞻性研究：一组为切口呈垂直-水平方向的正交组，另一组为切口呈斜向的斜向组。进行了空间对比敏感度、眩光和夜间视力测试，并比较了结果。随访期为3个月。
切口斜向时，眩光和对比敏感度受影响较小。在夜间视力影响方面没有显著差异。我们观察到斜向切口时诱导性散光减少。
睑裂内水平切口的位置以及水平和垂直切口长度不等是导致眼部改变的原因。斜向切口方向更可取，可避免眩光、星芒状光晕和诱导性散光。
