الفهرس 
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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)’