Purpose: The use of keratoprostheses (KPro) to restore vision in eyes with corneal opacities has become increasingly popular in the last five years. Intraocular pressure (IOP) is a cardinal measurement employed in glaucoma management. This presents a major problem since glaucoma remains a major visual limiting factor in eyes with KPro and most forms of tonometry require an intact cornea. The purpose of this study is to determine if transpalpebral IOP measurement can be an alternative method of measuring IOP and yield valuable data in eyes with KPro.
Results: The analysis included 23 eyes of 20 patients. The percentage agreement was 85% between tactile range and pnematonometer lOPs, and 95% between tactile range and Diaton lOPs. Pneumatonometer consistently yielded higher IOP values, compared to Diaton (p=0.04). The overall IOP mean ± SD was 17.2 ± 6 mmHg for pneumatonometer and 13.8± 5 mmHg for Diaton tonometer.
Conclusions: The presence of KPro did not appear to interfere with IOP with Diaton tonometer, and Diaton tonometer yielded IOP readings that were similar to those obtained by palpation. Scleral pneumotonometry yielded values that were consistently higher than tactile estimates and Diaton IOP. In addition to routine IOP estimates by palpation, transcleral and transpalpebral IOP measurements can be considered to monitor patients with KPro.
More details about Diaton transpalpebral tonometer at http://www.TonometerDiaton.com