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Arch Ophthalmol. 2000;118:73.

	Since this article does not have an abstract, we have provided the first 111 words of the full text and any section headings.

The author made many experiments in regard to the changes in corneal curvature following sections made with lances of various curvatures. He also measured the astigmatism following glaucoma and cataract operations. Sections made with the Graefe knife were not considered on account of the unavoidable irregularity in puncture and counterpuncture. Of 112 cases of glaucoma in which a lance 6-9 mm broad was used, it was found that in the meridian dividing the wound the refraction sank 0.5-2.5 D, while in the meridian at right angles it rose 0.5-3 D. On an average, the astigmatism produced was 2.76 D.

Reference: Weber A. The operative treatment of astigmatism. Arch Ophthalmol. 1900;29:126.