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Abstract Trahecutectomy Is now consid rod 10 be (he most popular and effective surgical PI’ cedurc in eyes with glaucoma a it provides adequate huraocular pressure (lOP) control with less complications in most cases (Kitazawa et (II J 993 amI SC(Jf! et a£. J 998) However, in the early postoperative period, a transient visual acuity loss is frequently observed. Possible causes of visual deterioration Iollowing trab culcciomy include hypotonic umculopathy, choroidal detachment, hyphema, vltTCOl’IS hemorrhage, anterior movement of’tae lens, and surgically induced corneal astigmatism. (ClwliDe et 0(., 1992) Previous videokeratographic tudics have shown that significant corneal astigmatism is induced by trabcculeceomy. In these studies. steepening of that portion of the peripheral cornea thai corre-sponds to the scleral flap was ob ·crved. (Rosenet at., 1992) However, it has not been shown l~lalsuch changes actually affect 11,1:, central optical zone. More important, it was not possible to evalute separately (he extent of tile induced regular or irregular astigmatism, Corneal thickness, likewise. has been reported to influence lOP measurements. (Claridge: elol:, 1995)’ |