recent years, therefore, we have seen the trabeculotomy of Redmond Smith (i960) and Allen and Burian (i 962), the sinusotomy of Krasnov (i 964), the trabeculotomy of Harms (i966) and Harms and Dannheim (1970) and the trabeculectomy of Cairns (I968).A good surgical operation must be judged by the following criteria:(i) The diseased or damaged tissue must be removed without detriment to the organ involved.(2) The operation must cure or control the condition for which it is performed.(3) The surgeon must be able to see the tips of his instruments at all stages of the operation so that the operation remains under his control at all times.(4) The procedure must be free of operative complications which cannot be readily contained.(5) The operation must be free of all major postoperative complications.(6) The procedure should be as simple as possible, so that there maybe an economy of effort andtime.
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Peter Watson (1972) studied this question.