Methods of measuring intraocular pressure in pathological conditions of the cornea

Relevance The development of pathological changes in the cornea can be a consequence of trauma, ophthalmological disease or as a result of eye surgery. In the presence of a changed corneal surface, as a consequence, its biomechanical properties change. Together, this leads to difficulties in conducting such an instrumental study as ophthalmotonometry [1, 2]. The main methods for measuring intraocular pressure are impression and applanation. However, in the presence of pathological changes in the corneal surface, these methods do not allow for a reliable determination of the level of ophthalmotonus. Currently, the biomechanical properties of the fibrous membrane are being actively studied. This allows for the development of new methods for measuring intraocular pressure: dynamic contour tonometry, point contour tonometry, including intracameral manometry [3]. Thanks to this, it has become possible to increase the accuracy of measuring the level of ophthalmotonus in this category of patients. When measuring intraocular pressure in patients with pathological conditions of the cornea, it is necessary to determine the thickness of the cornea and its biomechanical properties. The Ocular Response Analyzer (ORA) is a non-contact tonometer that operates on the principle of dynamic bidirectional corneal applanation. This method makes it possible to determine the level of ophthalmotonus taking into account the biomechanical parameters of the fibrous membrane. When measuring intraocular pressure with a manual Icare tonometer, the result was more accurate than with Goldman tonometry. The method of contour dynamic tonometry is comparable to Icare tonometry, gives a positive correlation of results, but is more difficult to perform [4, 5]. Conclusion Having analyzed the literature data, we can conclude that measuring intraocular pressure with the Icare device is the most rational and accurate method for pathological conditions of the cornea. Key words: glaucoma; ophthalmotonus; ophthalmotonometry; corneal pathology