Ever since the general acceptance of von Graefe's classical operation of iridectomy as the best operative treatment in the majority of cases of glaucoma, ophthalmic surgeons have observed that, in cases of chronic glaucoma, a more permanent benefit was often obtained in those in which, through some fault in technic, a cystoid scar resulted. Such a scar usually came about as the result of some entanglement or prolapse of shreds or tags of iris, with evidences that the anterior chamber communicated with the cystoid cavities by fistulous tracts. This observation led to deliberate attempts to produce such scars, and some operators advised leaving a bit of iris tissue somewhere in the wound for this purpose. Others, like de Wecker, Priestly-Smith and Critchett, while acknowledging the possible benefits, pointed out the dangers of infection and sympathetic disturbance from this procedure. In spite of this warning, several operators have recently advocated this
GREENWOOD A. THE FILTERING CICATRIX FOR CHRONIC GLAUCOMAWITH A REPORT OF CASES IN WHICH OPERATION WAS PERFORMED BY THE METHOD OF LAGRANGE. JAMA. 1910;55(3):190–194. doi:10.1001/jama.1910.04330030012004
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