IT HAS been known for a long time that the continuous application of external pressure to the eye produces a decrease in the intraocular tension. The response of healthy eyes to this so-called massage effect was thought to differ characteristically from the response of eyes with glaucoma. In the past, numerous investigators have attempted to utilize this difference as a clinically useful tool in the diagnosis of glaucoma. At first, the dynamometer of Bailliart was used to apply pressure to the eye, and the tension was taken with an ordinary tonometer. Interpretation of the data obtained in such a manner was hindered by a lack of understanding of the relation between intraocular pressure and volume of ocular contents. It was not until the work of Friedenwald1 in 1937 and 1939 that these relationships were clarified. He devised a table giving the volume of the corneal indentation and the intraocular
MANSHEIM BJ. AQUEOUS OUTFLOW MEASUREMENTS BY CONTINUOUS TONOMETRY IN SOME UNUSUAL FORMS OF GLAUCOMA. AMA Arch Ophthalmol. 1953;50(5):580–587. doi:10.1001/archopht.1953.00920030590004
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