ABSTRACT
BACKGROUND: A prototype of a pressure-sensitive contact lens (CL-DCT) based on dynamic contour tonometry (DCT) has been developed for continuous intraocular pressure (IOP) monitoring. The purpose of the present study was to assess the clinical applicability of this CL-DCT. MATERIAL AND METHODS: In 24 healthy subjects continuous IOP recording with the CL-DCT for 100 s was accomplished including IOP monitoring during 2 consecutive Valsalva manoeuvres. The measurement procedure was repeated after 5 min on the same eye and compared with the initial measurement. RESULTS: Continuous pressure curves were recorded in 20 subjects. The CL-DCT revealed an individual increase in IOP from 0.74 to 8.26 mmHg during the Valsalva manoeuvres. Comparison of the 2 consecutive IOP measurements yielded a mean deviation of +/-0.4 mmHg. CONCLUSIONS: CL-DCT allows non-invasive and continuous measurements of IOP. The measured values are comparable to the expected ones. Further studies are necessary to compare the measurement accuracy of CL-DCT with that of slit lamp adapted DCT (SL-DCT).
Subject(s)
Contact Lenses , Intraocular Pressure/physiology , Monitoring, Physiologic/instrumentation , Tonometry, Ocular/instrumentation , Equipment Design , Equipment Failure Analysis , Female , Humans , Male , Pressure , Reproducibility of Results , Sensitivity and Specificity , Tonometry, Ocular/methodsABSTRACT
BACKGROUND: Tumours in the superior orbital region can cause hypoglobus. We compare the pre- and postoperative globe position in two patients with different tumour types. HISTORY AND SIGNS: A 29-year-old man and a 58-year-old woman presented with pronounced hypoglobus. In both patients time-scale and importance of the lesion were comparable. Imaging suggested a pleomorphic adenoma in the younger patient, whereas the female patient was radiologically diagnosed with a hemangioma. THERAPY AND OUTCOME: Both radiological diagnoses could be histologically proven. Both lesions were excised in toto. The adenoma patient showed a full recovery of the preoperatively reduced vision. However, the hypoglobus persisted even after ten months. The hemangioma patient had an immediate full recovery of her hypoglobus. CONCLUSION: The histological type of a tumor in the superior orbit is of importance regarding the degree of reversibility of the accompanying hypoglobus.