Abstract
The use of the tonometer routinely in the examination of eyes preliminary to cataract extraction is advised. In the majority the tension will be found normal and choice of operative procedure is unrestricted. In those with subnormal tension it is advisable to dilate the pupil widely with atropin to promote ease of delivery of the lens which is liable to be luxated by pressure. In eyes showing notable increased tonus atropin is a source of danger. The tension should be lowered by suitable measures before extraction of the lens. Tonometric measurement may be made by the twelfth postoperative day if anything abnormal is noticed. The use of atropin is objectionable before or after discission. It is never necessary and frequently dangerous, as hypertension is apt to follow this operation due to imbibision of aqueous into the vitreous. Read at the third congress of the Pan-American Medical Association, Mexico, July, 1931.
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