Friedlander M H, Evans B J, Buzard K A, Granet N S
Department of Ophthalmology, Tulane University School of Medicine, New Orleans, Louisiana.
J Cataract Refract Surg. 1994 Sep;20(5):490-2. doi: 10.1016/s0886-3350(13)80225-8.
Radial incisions must be deep enough to correct myopia. As currently performed, most surgeons set their diamond blades at a constant depth and do not alter the blade length throughout the procedure. The cornea is not uniformly thick; the central cornea is the thinnest and it thickens toward the periphery. Therefore, an incision of constant depth would be deeper centrally and thinner peripherally. Peripheral redeepening of the cornea would in theory make the incision depth deeper throughout and should increase the effect of radial incisions. We reviewed the literature on this technique and performed radial incisional studies on the human cadaver eye using videokeratography to measure incision depth indirectly. Based on our studies, we believe that peripheral redeepening has no effect on central cornea flattening.
放射状切口必须足够深以矫正近视。按照目前的操作方式，大多数外科医生将钻石刀片设置为恒定深度，并且在整个手术过程中不改变刀片长度。角膜并非均匀厚度；角膜中央最薄，向周边逐渐增厚。因此，恒定深度的切口在中央会更深而在周边会更薄。理论上角膜周边再加深会使整个切口深度更深，并且应该会增加放射状切口的效果。我们查阅了关于该技术的文献，并使用角膜地形图仪对人类尸体眼睛进行放射状切口研究，以间接测量切口深度。基于我们的研究，我们认为周边再加深对中央角膜变平没有影响。
