Relative strength of scleral corneal and clear corneal incisions constructed in cadaver eyes.

Square scleral corneal, square clear corneal, and rectangular clear corneal incisions were constructed in six cadaver eyes that had no previous intraocular surgery. The 3.2 mm or smaller wounds had sutureless closures.

Corneal lip tunnel incision.

To evaluate whether the corneal lip tunnel incision or the sutureless closure causes any refractive problems, we performed a retrospective study on 387 cataract surgery patients who were divided into four groups based on type of wound closure and whether the corneal lip was made. The four groups consisted of patients who received an X-stitch closure without the corneal lip, a horizontal mattress stitch without the lip, a horizontal mattress stitch with the lip, and a sutureless closure with the lip. All patients had phacoemulsification in situ; implantation of a foldable silicone lens was performed through a scleral tunnel incision.

Relative strength of scleral tunnel incisions with internal corneal lips constructed in cadaver eyes.

We constructed scleral tunnel wounds with internal corneal lips and sutureless closures in ten cadaver eyes without previous intraocular surgery. Each wound differed in width, total incision length, and internal corneal lip size. At a low and high range of initial intraocular pressure (IOP, 10 to 15 mm Hg or 20 to 25 mm Hg), we compared the wounds' resistance to leakage during application of external pressure.