Abstract
The scleral suction cup is a reliable method of elevating the intraocular pressure. As long as the suction cup is placed in the same position on the globe and a minimum of 15 minutes is allowed between applications, the intraocular pressure elevation xoiih the application of the negative pressure is reproducible. However, the intraocular pressure corresponding to a given negative pressure on the suction cup varies from eye to eye. Further, this relationship cannot be predicted from the level of the intraocular pressure before the suction cup is applied to the, eye. In order to obtain the intraocular pressure which corresponds to the suction cup negative pressure, a separate calibration must be done for each eye studied. This is simplified to some extent because the relationship between the suction cup negative pressure and the intraocular pressure is linear between suction cup negative pressure -300 and -100 mm. Hg, although the slope of this straight line is not the same for every eye. A technique for obtaining the necessary information is described.