IN the operation of cataract extraction, we have used for several years a large number of corneo-scleral sutures. Operations are carried out in the classical way (corneal incision with a Graefe knife or with keratome and scissors with no conjunctival flap) and the wound is then closed by at least eleven sutures of 10/0 virgin silk using triangular corneal needles of the Vogt-Barraquer type (Grieshaber 81/7). These sutures are not removed. Firm hermetic closure of the wound is thus obtained. This suture technique allowed us to extend our previous observations on the post-operative behaviour of the eye (Giardini and Paliaga, 1961a, b; 1962a, b).(1) RE-FORMATION OF THE ANTERIOR CHAMBER.-After cataract extraction, the secondary aqueous restores the anterior chamber, which becomes deeper than before because the absence of the lens causes the iris to recede. If there has been an uneventful post-operative course, re-formation of the anterior chamber is generally seen when the eye is first dressed, about 24 hours after the operation. Information concerning the first 24 hours of the post-operative course has not been conclusive (Kronfeld, 1954;Scheie, 1954) so that the actual time was unknown, but a study of 44 patients (Giardini and Paliaga, 1963) has shown that, when the anterior chamber is hermetically closed, it re-forms within 3 hours at the most.In 87-5 per cent. of cases the anterior chamber re-formed within 2 hours (Fig. 1), and was usually deep enough to allow drainage from the angle 1 hour after operation.