A quantitative animal model of traumatic iridodialysis

Abstract

The impact velocities and kinetic energies necessary to create a particular form of ocular injury, traumatic iridodialysis, were quantitatively studied by experimentally traumatizing enucleate porcine eyes. Thicknesses and tensile strengths of porcine and human iris tissue were measured in order to allow for predictions of human results to be made from the animal model. Application of blunt trauma at an impact angle of 30-35 degrees with respect to the iris plane with striking of the eye at the corneolimbal junction was found to optimize tearing of the iris from the root. Using this vector, the minimum velocity for the creation of an iridodialysis at least 6 mm in length in the human eye is predicted to be 14 m/sec for impact with a projectile of 13.4 g with a 6 mm diameter tip.

Nonappositional repair of iridodialysis

“…When the eye is contused or the iris is accidentally engaged during an operation, separation occurs most frequently at this site. 1 Superior defects covered by a ptotic eyelid may be less symptomatic; however, an iridodialysis in any other quadrant can result in potentially debilitating visual sequelae, including monocular diplopia, glare, and photophobia.…”

İridodiyaliz Tashihi Sırasında İatrojenik Olarak Gelişen Küçük Lens Ön Kapsül Perforasyonunda Lense Yönelik Tedavi Yaklaşımı

“…İris kökünün irisin diğer anatomik bölümlerine göre daha zayıf ve ince olması bu bölgeyi travma sonrası yaralanmaya açık hale getirmektedir. 1 İridodiyaliz küçük boyutlarda olduğunda ve üst yarıda olduğunda üst göz kapağının defekti örtmesi nedeniyle herhangi bir semptom vermeyebilir. Özellikle alt yarı lokalizasyonlu ve bir saat kadranından daha büyük olan iridodiyalizler fotofobi, monoküler diplopi gibi fonksiyonel ve ayrıca kozmetik sorunlarla karşımıza çıkabilmektedir.…”

A Simple Surgical Technique to Repair Large Iridodialysis

“…Its pathogenesis is explained by the fact that the iris root is the thinnest and weakest portion of the iris stroma, hence more prone for detachment from the ciliary body after any traumatic insult having impact at the iris root. 1 A small localised and clinically insignificant (no diplopia or visual disturbances) iridodialysis may not require any surgical intervention. However, a large and clinically symptomatic iridodialysis often require surgical repair.…”

“…In literature, a number of surgical techniques have been described for the repair of symptomatic iridodialysis. [1][2][3][4][5][6] The coexistent zonular trauma may produce phacodonesis of the crystalline lens which should be taken care of. In this report, we describe a simple technique of repairing a large iatrogenic iridodialysis and implantation of a posterior-iris-fixated intraocular lens (IOL) in single-sitting.…”