[Further observations on the application of the campimetric method for measuring individually tolerated intraocular pressure in glaucoma].

The results of campimetric investigations performed in 127 eyes (83 patients) are presented. The vertical diameter of the blind spot and intraocular pressure were measured several times before and after oral intake of a dose of glycerol combined with ascorbic acid. The tonometric value obtained when the blind spot is smallest is considered the individually tolerated level of intraocular pressure. This tolerable pressure was determined in 105 eyes. In the overwhelming majority of the cases (95 eyes) the initial IOP values were within the standard (not exceeding 27 mmHg), according to the present glaucoma classification. However, in 64 eyes the IOP level approached the upper limit of the standard and only in 31 eyes was it between 18 and 22 mmHg. In contrast, the individually tolerated intraocular pressure in 99 eyes (94.3%) shifted to a level of between 18 and 22 mmHg and only in six cases. (5.7%) did the intraocular pressure also remain at the upper limit of the standard after intake of glycerol combined with ascorbic acid. These data show that the individually tolerable intraocular pressure, which does not interfere with the blood circulation in the retina and optic nerve, is in the 18-22 mmHg range in most patients. Under these conditions the vertical diameter of the blind spot (measured at a distance of 1 m with an object 2 mm in diameter) does not exceed 12 cm. This simple method of determining the individually tolerable method of determining the individually tolerable intraocular pressure can be used in any ophthalmological practice.