effect of external drainage operations on the scleral rigidity

Eighty eyes with chronic simple glaucoma were operated upon by trabeculectomy, Scheie's modified and iris inclusion operations. The scleral rigidity was measured, before operation and along a period of 30 months postoperatively. The mean coefficient of scleral rigidity was reduced from 0.0251 to 0.0231 in the eyes controlled with operation, from 0.0261 to 0.0240 in the eyes controlled with operation and miotics, and from 00255 to 0.0242 in the uncontrolled eyes with operation and miotics. The cause of reduction in the coefficient of scleral rigidity was the reduction in intra-ocular pressure and the addition of miotics in uncontrolled eyes with operation even with higher pressure

Krypton laser photoiridectomy in narrow-angle glaucoma

Krypton laser iridectomy was performed on 20 eyes of 14 patients. In eight eyes with closed angle glaucoma the intraocular pressure [IOP] was controlled within normal limits. Eleven eyes with narrow angles maintained a normal intraocular pressure after preventive laser iridectomy. Only in one eye with chronic closed-angle glaucoma the IOP was not controlled after laser iridectomy and the iridocorneal angle remained practically the same as before the procedure. The mean pressure was 28 mm.Hg. applanation before and 18 after the procedure. The iridectomies were performed with the use of Krypton laser power of 200 to 400 mw, exposure time of 0.1 to 0.2 S, and spot size of 50 to 200 u. Blue irides were slightly more resistant to treatment than brown irides. Krypton laser iridectomy by this technique is highly recommended as the procedure of choice for eyes with acute angle-closure glaucoma and for preventive iridectomy in the fellow eyes