Clinical trial of a noninvasive contact lens glucose sensor.

OBJECTIVE: The purpose of the present study was to determine the effectiveness of a fluorescent contact lens glucose sensor in monitoring glucose in patients with diabetes. METHODS: Under an institutional review board-approved protocol, five fasting patients with type II diabetes were given a challenge consisting of 75 mL of Sustacal (Thomson Micromedex, Greenwood, CO) by mouth. Contact lens fluorescence and venous blood glucose were measured over a 3-h period. RESULTS: Contact lens fluorescence appeared to track blood glucose well. The fluorescent daily-wear disposable contact lenses were comfortable and were tolerated well, even in patients who had not previously worn contact lenses. CONCLUSION: The contact lens glucose sensor shows promise as a home glucose monitor.

First clinical evaluation of a new long-term subconjunctival glucose sensor.

BACKGROUND: To evaluate the feasibility of an implantable subconjunctival glucose monitoring system (SGMS) for glucose monitoring in humans, we investigated the in vivo performance of the sensor in a clinical trial with five patients. METHODS: The new SGMS consists of an implantable ocular mini implant (OMI) and a hand-held fluorescence photometer. The implantable subconjunctival glucose sensor is composed of a fluorescence resonance energy transfer system based on Concanavalin A chemistry, embedded in a nelfilcon polymer hydrogel disk. Blood glucose changes in humans were induced by oral glucose intake and insulin injections. RESULTS: The in vivo response of the new SGMS was tested in a first human clinical study with five diabetes patients. The OMI was well tolerated in the eyes of the patients. The SGMS exhibited high correlation coefficients (>0.88) with blood glucose changes and a good stability of the sensor response to glucose for the study period of 2 weeks. Lag times were in the range of 5-10 min. A total of 98% of all data pairs was in the clinical acceptable ranges A and B of the consensus error grid. CONCLUSIONS: For the first time, the possibility to measure glucose in vivo in the subconjunctival interstitial fluid for a period of 2 weeks was demonstrated in a human clinical trial.