Mansour A M
Department of Ophthalmology, University of Texas, Medical Branch, Galveston 77550.
Refract Corneal Surg. 1992 Sep-Oct;8(5):385-8.
Ab interno radial keratotomy is a keratorefractive procedure with radial incisions made by externalizing a blade inserted in the deep stroma. A major limitation of the procedure is the technical inability to establish a safe pre-Descemetic stromal entry of the blade with subsequent suboptimal depth of the radial incisions. A technique to delineate Descemet's membrane was investigated to obtain deeper incisions with the ab interno radial keratotomy.
Air was injected with a 30-gauge needle mounted on a 3-milliliter syringe and entering the deep stroma at the limbus in human donor eyes. The injection was done in a pulse fashion with the needle tip advanced 3 mm away from the limbus. Ab interno radial keratotomy was then performed with and without air injection.
Bubbles were localized to the pre-Descemet region. The depth of the radial keratotomy incisions increased from 57.7% (SD = 11.5%) without air injection, to 83.0% (SD = 10.6%) with air injection.
Deep stromal air injection delineates the pre-Descemet space, allowing deeper radial incisions with the ab interno radial keratotomy.
内路放射状角膜切开术是一种角膜屈光手术，通过将插入深层基质的刀片外置来制作放射状切口。该手术的一个主要局限性是技术上无法安全地在Descemet膜前基质层进入刀片，导致放射状切口深度不理想。研究了一种描绘Descemet膜的技术，以在内路放射状角膜切开术中获得更深的切口。
使用安装在3毫升注射器上的30号针头在人类供体眼的角膜缘处向深层基质注入空气。以脉冲方式进行注射，针尖距角膜缘3毫米。然后在有和没有空气注入的情况下进行内路放射状角膜切开术。
气泡定位在Descemet膜前区域。放射状角膜切开术切口的深度从无空气注入时的57.7%（标准差=11.5%）增加到有空气注入时的83.0%（标准差=10.6%）。
深层基质空气注入可描绘Descemet膜前间隙，在内路放射状角膜切开术中允许制作更深的放射状切口。
