Intraocular pressure tonometry.

The family physician should include measurement of the intraocular pressure in his examination. Chronic open-angle glaucoma can be discovered early. Tactile tension is not adequate. Many methods are available, but the Schiøtz tonometer is the best for general use. Careful attention to technique is required. When the tonometer reveals an intraocular pressure exceeding 21 mm. Hg, further studies are necessary for a diagnosis of glaucoma.