[Changes in corneal refraction after cataract surgery--comparison of the posterior limbic and the scleral tunnel incision].

The authors evaluate the results of keratometry in a group of 235 patients after surgery of cataract who were operated by the technique of posterior limbal and scleral tunnel section by the same surgeon. Posterior limbal section induced after surgery astigmatism, on average +4.0 D in the median section, the scleral tunnel section about +2.0 D. Astigmatism after the posterior limbal section improved spontaneously during the fourth month after surgery; if it persisted, it improved after discontinuation of the suture. Slight astigmatism after the posterior limbal section developed easily after four months following operation into astigmatism against the rule. Astigmatism after a scleral tunnel section disappeared after the fourth month following operation but did not develop against the rule. Both types of sections induced after surgery similar but negligible changes of the spheral corneal equivalent.