since fistulizing procedures involve a risk of malignant glaucoma , nd-yag laser iridotomy , which this investigation showed to be risk-free , is the initial procedure of choice in narrow-angle conditions , especially subacute and chronic angle-closure glaucoma , in order to alleviate the angle-closure component in such angle-closure situations , to diagnose its contribution to peak iop , and to facilitate argon laser trabeculoplasty when needed .
C0220825
investigation
C0184661
procedure